Fix for StaticInt no longer subtyping Integer

[vandenman]

Fixes #79

Adds Static as a direct dependency (it was already an indirect dependency).

Tests pass locally with Static v0.7.8 and Static v0.8.8, hence the compat bounds of 0.7, 0.8.

Suggestions, comments and other feedback is welcome!

With this fix I was able to obtain these benchmark results:

julia> versioninfo()
Julia Version 1.9.4
Commit 8e5136fa297 (2023-11-14 08:46 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 64 × AMD Ryzen Threadripper PRO 3975WX 32-Cores
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, znver2)
  Threads: 64 on 64 virtual cores
Environment:
  JULIA_EDITOR = code

Comparing them to the ones on https://github.com/JuliaLinearAlgebra/Octavian.jl, they are pretty interesting. Unsurprisingly, MKL.jl does not do very well since this is on an AMD CPU. Surprisingly, the performance of BLIS drops massively from size 244 (median 783.96 GFLOPS) to size 249 (median 55.69 GFLOPS). No idea what is going on there. The performance of the other libraries seems to agree with the results in Octavian.jl.

[chriselrod]

That's an interesting CPU, you're welcome to add those results to the README or docs of either package.

Thanks for the fix!