refactor: move library loading logic to separate crate

[Wodann]

No description provided.

[codecov]

Codecov Report

Merging #252 into master will increase coverage by 0.01%.
The diff coverage is 76.66%.

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   79.09%   79.11%   +0.01%     
==========================================
  Files         200      201       +1     
  Lines       12749    12767      +18     
==========================================
+ Hits        10084    10100      +16     
- Misses       2665     2667       +2     

Impacted Files	Coverage Δ
crates/mun_libloader/src/temp_library.rs	88.88% <ø> (ø)
crates/mun_runtime/tests/util.rs	83.63% <ø> (ø)
crates/mun_libloader/src/lib.rs	72.00% <72.00%> (ø)
crates/mun_runtime/src/assembly.rs	69.14% <100.00%> (+2.81%)	⬆️

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