Sync from L1

[joshklop]

The diff is nicer than it looks. Maybe ~500 lines of actual code, only ~100 of which is interesting/bug-prone.

[codecov]

Codecov Report

Attention: Patch coverage is 68.31502% with 173 lines in your changes missing coverage. Please review.

Project coverage is 72.75%. Comparing base (3d4f630) to head (b59bca2).
Report is 379 commits behind head on main.

Files with missing lines	Patch %	Lines
syncl1/syncl1.go	52.45%	46 Missing and 12 partials ⚠️
l1data/l1data.go	73.86%	36 Missing and 16 partials ⚠️
cmd/juno/juno.go	17.50%	33 Missing ⚠️
syncl1/iterator.go	60.00%	12 Missing and 6 partials ⚠️
l1data/fetcher.go	53.84%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1335      +/-   ##
==========================================
- Coverage   72.95%   72.75%   -0.20%     
==========================================
  Files          96      104       +8     
  Lines        9997    10559     +562     
==========================================
+ Hits         7293     7682     +389     
- Misses       2163     2298     +135     
- Partials      541      579      +38     

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