Update REQUESTS Doc to Latest Version

[noelcarl]

What changed?

This change adds the missing schemas for the outgoing requests in the REQUESTS.md document, and separates the required operational requests, and the optional requests (requests to intake service) into two separate sections.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.96%. Comparing base (7b558c1) to head (02a5f24).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   48.96%   48.96%           
=======================================
  Files         307      307           
  Lines       34582    34582           
  Branches     1303     1308    +5     
=======================================
  Hits        16932    16932           
+ Misses      17051    17045    -6     
- Partials      599      605    +6     

Flag	Coverage Δ
test-go	55.06% <ø> (ø)
test-js	43.58% <ø> (ø)
test-py	49.17% <ø> (ø)

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