Added support for loading URLs in CompilerEnvStateReader.read_paths()

[thecoblack]

Fixes #148 Hi! This PR adds support for loading content from URLs. Regarding the tests, CompilerEnvStateReader.read_paths does not have any coverage yet, so I have added tests for other method features like input pipe or paths. LMK what you think :)!

[codecov-commenter]

Codecov Report

Merging #692 (f105d45) into development (9ad5fbb) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #692      +/-   ##
===============================================
- Coverage        88.64%   88.61%   -0.03%     
===============================================
  Files              131      131              
  Lines             7926     7934       +8     
===============================================
+ Hits              7026     7031       +5     
- Misses             900      903       +3     

Impacted Files	Coverage Δ
compiler_gym/compiler_env_state.py	100.00% <100.00%> (ø)
compiler_gym/envs/llvm/datasets/cbench.py	79.42% <0.00%> (-1.09%)	⬇️

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[ChrisCummins]

Hi @thecoblack, thanks for the patch! Your code looks clean and I appreciate the tests, thank you.

It looks like there is a missing module import. Couple of other minor suggestions left inline.

Cheers,
Chris

[ChrisCummins]

LGTM, thanks @thecoblack!

Cheers,
Chris