feat: ensure enough peers on all subnets

[twoeths]

Motivation

• this is a precondition for feat: only subscribe to sampled subnets #7860
• when publishing a block, we need to ensure we have enough peers on all column subnets so that we can publish all blobs data to the network
• this is not a concern for a node without validator but since this is very easy to achieve, we don't need to care this case

Description

• track samplingGroups on PeerData
• for sampling groups, ensure at least 6 per subnets
• for non-sampling groups, ensure at least 4 per subnets

Metrics on fusaka-devnet-2
we have 25-35 peers on all subnets, so this is more than enough

[codecov]

Codecov Report

Attention: Patch coverage is 64.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 54.28%. Comparing base (9f30766) to head (3998c0f).
Report is 8 commits behind head on peerDAS.

Additional details and impacted files

@@             Coverage Diff             @@
##           peerDAS    #8057      +/-   ##
===========================================
- Coverage    54.28%   54.28%   -0.01%     
===========================================
  Files          844      844              
  Lines        62555    62672     +117     
  Branches      4702     4733      +31     
===========================================
+ Hits         33961    34019      +58     
- Misses       28520    28579      +59     
  Partials        74       74              

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[twoeths]

works fine on fusaka-devnet-2. In fact this PR should not effect anything on devnet because we connect to a lot of super nodes and average peers per data column subnet is so high (25-35)

[matthewkeil]

LGTM!!! 🚀

[wemeetagain]

🎉 This PR is included in v1.34.0 🎉