Add the tests from base

[ViralBShah]

Move various sparse tests from julia base tests into basetests.jl here.

This leaves mentions of SparseArrays in hashing.jl, ambiguous.jl (sparse tests are excluded there), and precompile.jl. I believe these need to stay in base.

➜  test git:(vs/sparsetests) ✗ git grep SparseArrays | cat
ambiguous.jl:using LinearAlgebra, SparseArrays, SuiteSparse
ambiguous.jl:    STDLIBS = filter!(x -> x != "LinearAlgebra" && x != "SparseArrays" && # Some packages run this test themselves
hashing.jl:using Random, LinearAlgebra, SparseArrays
precompile.jl:                 :SparseArrays, :Statistics, :SuiteSparse, :TOML, :Tar, :Test, :UUIDs, :Unicode,

[codecov]

Codecov Report

Merging #70 (a0edc75) into main (f76aff9) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   88.97%   88.98%   +0.01%     
==========================================
  Files           7        7              
  Lines        5667     5667              
==========================================
+ Hits         5042     5043       +1     
+ Misses        625      624       -1     

Impacted Files	Coverage Δ
src/sparsematrix.jl	94.95% <0.00%> (+0.04%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f76aff9...a0edc75. Read the comment docs.

[ViralBShah]

We should bump stdlibs for this package once we merge, since these tests will be removed from julia base.