Add request length check to json rpcs

[philipsu522]

Describe your changes and provide context

We should limit the request of json rpc calls

Testing performed to validate your change

• unit tests
• tested on remote node

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.19%. Comparing base (66ac407) to head (5d3c0e6).

❗ Current head 5d3c0e6 differs from pull request most recent head fbccf90. Consider uploading reports for the commit fbccf90 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
+ Coverage   58.13%   58.19%   +0.05%     
==========================================
  Files         249      249              
  Lines       33935    33940       +5     
==========================================
+ Hits        19729    19752      +23     
+ Misses      12636    12626      -10     
+ Partials     1570     1562       -8     

Files	Coverage Δ
rpc/jsonrpc/server/http_json_handler.go	68.31% <100.00%> (+1.65%)	⬆️

... and 17 files with indirect coverage changes