chore: add sepolia config and subgraph

[levalleux-ludo]

Description

{{what was done}}

How to test

{{how can it be tested}}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.39%. Comparing base (f571d28) to head (170736d).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #686      +/-   ##
==========================================
+ Coverage   89.07%   89.39%   +0.31%     
==========================================
  Files         153      153              
  Lines        5612     5618       +6     
  Branches      824      826       +2     
==========================================
+ Hits         4999     5022      +23     
+ Misses        613      596      -17     

Flag	Coverage Δ
common	95.53% <100.00%> (+9.81%)	⬆️
core-sdk	59.59% <ø> (ø)
e2e	85.84% <0.00%> (-0.06%)	⬇️
eth-connect-sdk	97.29% <ø> (+0.03%)	⬆️
ethers-sdk	70.03% <ø> (+0.11%)	⬆️
ipfs-storage	90.90% <ø> (ø)
metadata	94.70% <ø> (ø)
unittests	63.22% <100.00%> (+0.34%)	⬆️

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