Resample multi-channel signals

[ymtoo]

This PR enables resampling on multi-channel signals.

Before:

julia> x = cw(7kHz, 1s, 44.1kHz)
julia> sresample([x x], 3//2)
ERROR: UndefKeywordError: keyword argument `dims` not assigned

After:

julia> sresample([x x], 3//2)
SampledSignal @ 66150.0 Hz, 66150×2 Matrix{ComplexF64}:

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (359412c) 78.38% compared to head (3d38983) 78.38%.

❗ Current head 3d38983 differs from pull request most recent head 6f04847. Consider uploading reports for the commit 6f04847 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   78.38%   78.38%           
=======================================
  Files          10       10           
  Lines         828      828           
=======================================
  Hits          649      649           
  Misses        179      179           

Files Changed	Coverage Δ
src/dsp.jl	97.19% <100.00%> (ø)

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[mchitre]

Suggested change

	x1 = resample([x x], 3//2; dims=1)
	x1 = resample([x x], 3//2)

[ymtoo]

dims=1 is removed.