Support spMv operation with SparseArrays containers

[guimarqu]

• fixing some incorrect implementations of the interface
• packed memory array now wrapped in a DynamicVector
• maintaining the size of the vector and matrix
• supporting spMv operations with SparseArrays containers

[codecov]

Codecov Report

Merging #32 (84083ad) into master (61be5e6) will decrease coverage by 0.32%.
The diff coverage is 97.61%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   98.69%   98.37%   -0.33%     
==========================================
  Files          11       11              
  Lines         842      922      +80     
==========================================
+ Hits          831      907      +76     
- Misses         11       15       +4     

Impacted Files	Coverage Δ
src/vector.jl	94.64% <94.64%> (ø)
src/matrix.jl	100.00% <100.00%> (ø)
src/operations.jl	100.00% <100.00%> (ø)
src/pcsr.jl	98.98% <100.00%> (+0.05%)	⬆️
src/pma.jl	98.84% <100.00%> (-0.18%)	⬇️
src/utils.jl	92.30% <0.00%> (-1.98%)	⬇️
src/finds.jl	100.00% <0.00%> (ø)
src/moves.jl	100.00% <0.00%> (ø)
src/buffer.jl	100.00% <0.00%> (ø)
... and 5 more

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