No need to import init functions into namespace, since they are defined in it

Removed "using dpctl::tensor::py_internal::init_abs`, since this imports `init_abs`
into the current namespace from `dpctl::tensor::py_internal`, but this namespace is
the current namespace and so the import is a no-op.

Also added brief docstring for the common init module.

Author: oleksandr-pavlyk

dpctl/tensor/libtensor/source/elementwise_functions/elementwise_common.cpp

@@ -103,143 +103,76 @@ namespace tensor
 namespace py_internal
 {
 
+/*! @brief Add elementwise functions to Python module */
 void init_elementwise_functions(py::module_ m)
 {
-    using dpctl::tensor::py_internal::init_abs;
     init_abs(m);
-    using dpctl::tensor::py_internal::init_acos;
     init_acos(m);
-    using dpctl::tensor::py_internal::init_acosh;
     init_acosh(m);
-    using dpctl::tensor::py_internal::init_add;
     init_add(m);
-    using dpctl::tensor::py_internal::init_asin;
     init_asin(m);
-    using dpctl::tensor::py_internal::init_asinh;
     init_asinh(m);
-    using dpctl::tensor::py_internal::init_atan;
     init_atan(m);
-    using dpctl::tensor::py_internal::init_atan2;
     init_atan2(m);
-    using dpctl::tensor::py_internal::init_atanh;
     init_atanh(m);
-    using dpctl::tensor::py_internal::init_bitwise_and;
     init_bitwise_and(m);
-    using dpctl::tensor::py_internal::init_bitwise_invert;
     init_bitwise_invert(m);
-    using dpctl::tensor::py_internal::init_bitwise_left_shift;
     init_bitwise_left_shift(m);
-    using dpctl::tensor::py_internal::init_bitwise_or;
     init_bitwise_or(m);
-    using dpctl::tensor::py_internal::init_bitwise_right_shift;
     init_bitwise_right_shift(m);
-    using dpctl::tensor::py_internal::init_bitwise_xor;
     init_bitwise_xor(m);
-    using dpctl::tensor::py_internal::init_cbrt;
     init_cbrt(m);
-    using dpctl::tensor::py_internal::init_ceil;
     init_ceil(m);
-    using dpctl::tensor::py_internal::init_conj;
     init_conj(m);
-    using dpctl::tensor::py_internal::init_copysign;
     init_copysign(m);
-    using dpctl::tensor::py_internal::init_cos;
     init_cos(m);
-    using dpctl::tensor::py_internal::init_cosh;
     init_cosh(m);
-    using dpctl::tensor::py_internal::init_equal;
+    init_divide(m);
     init_equal(m);
-    using dpctl::tensor::py_internal::init_exp;
     init_exp(m);
-    using dpctl::tensor::py_internal::init_exp2;
     init_exp2(m);
-    using dpctl::tensor::py_internal::init_expm1;
     init_expm1(m);
-    using dpctl::tensor::py_internal::init_floor;
     init_floor(m);
-    using dpctl::tensor::py_internal::init_floor_divide;
     init_floor_divide(m);
-    using dpctl::tensor::py_internal::init_greater;
     init_greater(m);
-    using dpctl::tensor::py_internal::init_greater_equal;
     init_greater_equal(m);
-    using dpctl::tensor::py_internal::init_hypot;
     init_hypot(m);
-    using dpctl::tensor::py_internal::init_imag;
     init_imag(m);
-    using dpctl::tensor::py_internal::init_isfinite;
     init_isfinite(m);
-    using dpctl::tensor::py_internal::init_isinf;
     init_isinf(m);
-    using dpctl::tensor::py_internal::init_isnan;
     init_isnan(m);
-    using dpctl::tensor::py_internal::init_less;
     init_less(m);
-    using dpctl::tensor::py_internal::init_less_equal;
     init_less_equal(m);
-    using dpctl::tensor::py_internal::init_log;
     init_log(m);
-    using dpctl::tensor::py_internal::init_log10;
     init_log10(m);
-    using dpctl::tensor::py_internal::init_log1p;
     init_log1p(m);
-    using dpctl::tensor::py_internal::init_log2;
     init_log2(m);
-    using dpctl::tensor::py_internal::init_logaddexp;
     init_logaddexp(m);
-    using dpctl::tensor::py_internal::init_logical_and;
     init_logical_and(m);
-    using dpctl::tensor::py_internal::init_logical_not;
     init_logical_not(m);
-    using dpctl::tensor::py_internal::init_logical_or;
     init_logical_or(m);
-    using dpctl::tensor::py_internal::init_logical_xor;
     init_logical_xor(m);
-    using dpctl::tensor::py_internal::init_maximum;
     init_maximum(m);
-    using dpctl::tensor::py_internal::init_minimum;
     init_minimum(m);
-    using dpctl::tensor::py_internal::init_multiply;
     init_multiply(m);
-    using dpctl::tensor::py_internal::init_negative;
     init_negative(m);
-    using dpctl::tensor::py_internal::init_not_equal;
     init_not_equal(m);
-    using dpctl::tensor::py_internal::init_positive;
     init_positive(m);
-    using dpctl::tensor::py_internal::init_pow;
     init_pow(m);
-    using dpctl::tensor::py_internal::init_proj;
     init_proj(m);
-    using dpctl::tensor::py_internal::init_real;
     init_real(m);
-    using dpctl::tensor::py_internal::init_remainder;
     init_remainder(m);
-    using dpctl::tensor::py_internal::init_round;
     init_round(m);
-    using dpctl::tensor::py_internal::init_rsqrt;
     init_rsqrt(m);
-    using dpctl::tensor::py_internal::init_sign;
     init_sign(m);
-    using dpctl::tensor::py_internal::init_signbit;
     init_signbit(m);
-    using dpctl::tensor::py_internal::init_sin;
     init_sin(m);
-    using dpctl::tensor::py_internal::init_sinh;
     init_sinh(m);
-    using dpctl::tensor::py_internal::init_sqrt;
     init_sqrt(m);
-    using dpctl::tensor::py_internal::init_square;
     init_square(m);
-    using dpctl::tensor::py_internal::init_subtract;
     init_subtract(m);
-    using dpctl::tensor::py_internal::init_tan;
     init_tan(m);
-    using dpctl::tensor::py_internal::init_tanh;
     init_tanh(m);
-    using dpctl::tensor::py_internal::init_divide;
-    init_divide(m);
-    using dpctl::tensor::py_internal::init_trunc;
     init_trunc(m);
 }