chore: use java text block

Author: kuhe

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/ServiceAggregatedClientGenerator.java

@@ -99,26 +99,24 @@ public void run() {
                     shape -> shape.getAllMembers().values().stream().noneMatch(MemberShape::isRequired)
                 ).orElse(true);
                 if (inputOptional) {
-                    writer.addImport("OptionalParameter", null, TypeScriptDependency.SMITHY_TYPES);
-                    writer.write("""
-                        $L(): Promise<$T>;""", methodName, output);
+                    writer.write("$L(): Promise<$T>;", methodName, output);
                 }
                 writer.write("""
-                    $L(
-                      args: $T,
-                      options?: $T,
-                    ): Promise<$T>;""", methodName, input, applicationProtocol.getOptionsType(), output);
-                writer.write("""
-                    $L(
-                      args: $T,
-                      cb: (err: any, data?: $T) => void
-                    ): void;""", methodName, input, output);
-                writer.write("""
-                    $L(
-                      args: $T,
-                      options: $T,
-                      cb: (err: any, data?: $T) => void
-                    ): void;""", methodName, input, applicationProtocol.getOptionsType(), output);
+                    $1L(
+                      args: $2T,
+                      options?: $3T,
+                    ): Promise<$4T>;
+                    $1L(
+                      args: $2T,
+                      cb: (err: any, data?: $4T) => void
+                    ): void;
+                    $1L(
+                      args: $2T,
+                      options: $3T,
+                      cb: (err: any, data?: $4T) => void
+                    ): void;""",
+                    methodName, input, applicationProtocol.getOptionsType(), output
+                );
                 writer.write("");
             }
         });