feat: add getproof-storage-keys-cap in JSON-RPC config

[mmsqe]

Description

to avoid consume significant RPC bandwidth during proof generation and response encoding

Closes: #XXXX

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Author Checklist

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I have...

• tackled an existing issue or discussed with a team member
• left instructions on how to review the changes
• targeted the main branch

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 65.23%. Comparing base (0310aa9) to head (88d08e5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
server/config/config.go	96.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1007      +/-   ##
==========================================
- Coverage   65.37%   65.23%   -0.15%     
==========================================
  Files         319      319              
  Lines       22223    22232       +9     
==========================================
- Hits        14528    14502      -26     
+ Misses       6505     6503       -2     
- Partials     1190     1227      +37     

Files with missing lines	Coverage Δ
rpc/backend/account_info.go	69.23% <100.00%> (-17.97%)	⬇️
server/config/config.go	40.68% <96.00%> (-6.12%)	⬇️

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