chore: add snapshot testing via md files

[mogery]

Summary:
This PR adds tests/execution_spec.rs, which uses snapshots via insta and .md specs to perform testing, like outlined in #983. It also adds testconv, an automatic test converter.

To-do:

• Convert from http_spec
• Convert from graphql_spec

Issue Reference(s):
Fixes #983
/claim #983

Build & Testing:

• I ran cargo test successfully.
• I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• I have added relevant unit & integration tests.
• I have updated the documentation accordingly.
• I have performed a self-review of my code.
• PR follows the naming convention of <type>(<optional scope>): <title>

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f3cf2f1) 88.26% compared to head (9976d54) 88.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1054      +/-   ##
==========================================
+ Coverage   88.26%   88.38%   +0.11%     
==========================================
  Files         102      102              
  Lines       10994    10994              
==========================================
+ Hits         9704     9717      +13     
+ Misses       1290     1277      -13     

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[mogery]

This is now ready. I've also written some docs.

[tusharmath]

/tip 50$

[algora-pbc]

🎉🎈 @mogery has been awarded $50! 🎈🎊

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