Use AbstractSparseMatrixCSC

[tkf]

• Wait for RFC: AbstractSparseMatrixCSC interface JuliaLang/julia#33054 and Refactoring: Add AbstractSparseMatrixCSC JuliaLang/julia#33039 (AbstractSparseMatrixCSC)
• Wait for Rename: getcolptr -> colptrs JuliaLang/julia#33041 (colptrs)

[codecov-io]

Codecov Report

Merging #2 into master will decrease coverage by 0.54%.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #2      +/-   ##
=======================================
- Coverage   90.54%   90%   -0.55%     
=======================================
  Files           6     6              
  Lines         328   330       +2     
=======================================
  Hits          297   297              
- Misses         31    33       +2

Impacted Files	Coverage Δ
src/matrix.jl	79.31% <0%> (-5.88%)	⬇️

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