Use Aqua to enforce quality

[jishnub]

Fixes some unbound args. There's still one issue that remains in https://github.com/JuliaMatrices/InfiniteLinearAlgebra.jl/blob/d8afdfeffee95ac47ce8454f16344723756f1203/src/blockbanded/blockbanded.jl#L62-L63
but there's an ambiguity for N=0 that needs to be fixed first. Once this is resolved, the unbound_args=false may be removed from the test.

[codecov]

Codecov Report

Base: 77.35% // Head: 77.35% // No change to project coverage 👍

Coverage data is based on head (34253d7) compared to base (b61183e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   77.35%   77.35%           
=======================================
  Files          11       11           
  Lines        1307     1307           
=======================================
  Hits         1011     1011           
  Misses        296      296           

Impacted Files	Coverage Δ
src/blockbanded/blockbanded.jl	94.87% <100.00%> (ø)
src/infql.jl	46.51% <100.00%> (ø)

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