added several improvements

[schlichtanders]

new:

• rqatrend compilation using staticcompiler

  • just staticcompile (runs staticcompiler on julia 1.10 in dockerimage with local caching of julia for best development experience)
  • test case for compiled library from julia
  • test case for compiled library from python

• added standard testsuites:

  • Aqua.jl quality assurance tests
  • Documenter.jl doctests

• added pre-commit hooks with auto formatting

  • install instructions in extra README_DEVELOPER.md
  • using JuliaFormatter blue style
  • also integrated into VSCode formatting

changed:

• Artifacts.toml is now on top level, and test dependency marked as lazy
• Dockerfile is improved to do packagecompilation on its own (again using local caching of julia, but still takes time as usual for packagecompilation)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.16%. Comparing base (bb264ae) to head (0ed7294).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   74.03%   74.16%   +0.12%     
==========================================
  Files           5        6       +1     
  Lines         208      209       +1     
==========================================
+ Hits          154      155       +1     
  Misses         54       54              

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