feat(full-node): watch L2 chain tip

[kariy]

Watch L2 chain tip instead of watching for the latest settled/proven block number in the Starknet Core Contract (ie L1 tip)

[codecov]

Codecov Report

❌ Patch coverage is 90.42553% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.72%. Comparing base (9bde0ae) to head (6ae5042).
⚠️ Report is 182 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/node/src/full/tip_watcher.rs	92.39%	7 Missing ⚠️
crates/node/src/full/mod.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
+ Coverage   73.32%   73.72%   +0.39%     
==========================================
  Files         209      254      +45     
  Lines       23132    31204    +8072     
==========================================
+ Hits        16961    23004    +6043     
- Misses       6171     8200    +2029     

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