feat: improve range sync in fulu

[twoeths]

Motivation

• stablize range sync and add metrics to it

Description

• should not do a range sync with peer that has lower target slot than the one in batch
• from fulu, we care about custody columns to pick a good peers
• switch from the most common target to highest target, see this for more context
• more metrics: how many peers per column in SyncChain
• more unit tests for PeerBalancer

Testing

• [x] synced from a stopped mainnet node
• [ ] waiting for peerdas-devnet-7 to test

[twoeths]

blocked by https://github.com/ChainSafe/lodestar/issues/7754

[matthewkeil]

There is a bug from earliestAvailableSlot that should get addressed by this PR

https://github.com/ChainSafe/lodestar/pull/7959#discussion_r2162626526

[twoeths]

convert to draft as we'll need a PR for fusaka-devnet-2, need to test te/sync_pick_good_peers_fusaka_devnet_2

[twoeths]

tested successfully on fusaka-devnet-2, see https://github.com/ChainSafe/lodestar/pull/8029#issue-3192494519

I notice that there are still some hiccup when syncing, need to also recover columns when syncing like in #7940

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.90647% with 46 lines in your changes missing coverage. Please review.

Project coverage is 54.24%. Comparing base (d30e8de) to head (15d77ec). Report is 1 commits behind head on peerDAS.

Additional details and impacted files

@@            Coverage Diff            @@
##           peerDAS    #7746    +/-   ##
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  Coverage    54.24%   54.24%            
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  Files          844      844            
  Lines        62606    62710   +104     
  Branches      4707     4723    +16     
=========================================
+ Hits         33960    34018    +58     
- Misses       28573    28618    +45     
- Partials        73       74     +1     

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[wemeetagain]

:tada: This PR is included in v1.34.0 :tada: