Add all potential RPC method mappings

[justincavery]

Added commented out multiple RPC method mappings for clarity.

We were moving from an nginx configuration which allowed for all methods to be passed through and found it difficult to define the right list for proxyd to support our Graph Indexers.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.43%. Comparing base (2256f8a) to head (4453f19).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #504      +/-   ##
==========================================
+ Coverage   58.38%   58.43%   +0.04%     
==========================================
  Files          91       91              
  Lines       13064    13064              
==========================================
+ Hits         7628     7634       +6     
+ Misses       4986     4981       -5     
+ Partials      450      449       -1     

Flag	Coverage Δ
proxyd	72.60% <ø> (+0.13%)	⬆️

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see 1 file with indirect coverage changes

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