add dot(x, A, y) for sparse matrices

[felix-roehrich]

This PR adds the following dispatches

dot(x::SRow{T}, A::SMat{T}, y::SRow{T}) where T
dot(x::MatrixElem{T}, A::SMat{T}, y::MatrixElem{T}) where T
dot(x::AbstractVector{T}, A::SMat{T}, y::AbstractVector{T}) where T

If you have any suggestions for improvements, let me know.

[thofma]

@lgoettgens maybe you also want to have an artificial look? Since you also implemented a few things recently.

[codecov]

Codecov Report

Merging #1263 (4d17e80) into master (787d345) will decrease coverage by 0.08%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1263      +/-   ##
==========================================
- Coverage   74.55%   74.47%   -0.08%     
==========================================
  Files         346      346              
  Lines      111273   111320      +47     
==========================================
- Hits        82962    82910      -52     
- Misses      28311    28410      +99     

Files	Coverage Δ
src/Sparse/Matrix.jl	71.44% <100.00%> (+1.84%)	⬆️

... and 26 files with indirect coverage changes

[thofma]

Yes, but please use nrows and ncols functions.

[thofma]

Do you want a quick release to use it in Oscar?

[felix-roehrich]

Do you want a quick release to use in Oscar?

Thank you, but this is not necessary.