Add XRPL Commons Bootstrap Cluster (hub.xrpl-commons.org)

[Tokeiito]

This pull request adds hub.xrpl-commons.org as a new Bootstrap Cluster in the rippled configuration. XRPL Commons is already well-known within the XRPL community for its educational resources and infrastructure contributions (e.g., UNL Validator, Testnet validator, private ledger for testing testing). We have been considering running a bootstrap cluster for at least a year, and after three months of active work, we are ready to propose this addition.

Details:

Infrastructure Setup:
    The cluster is hosted on dedicated hardware in European data centers.
    Currently consists of four nodes, each behind a load balancer with active health checks.
    Each node accepts up to 400 peers (subject to adjustment based on future demand).
    The setup is designed for easy scalability—up or down—depending on usage requirements.
Minimal History & Peering Only:
    The cluster is configured to store only the bare minimum of ledger history.
    It is dedicated to peering, ensuring efficient and stable connectivity for clients.
Access:
    The Bootstrap Cluster endpoint is: [hub.xrpl-commons.org](https://hub.xrpl-commons.org/)

We appreciate your review and consideration of our request to include this new bootstrap cluster in the official rippled repository. If you have any questions or require additional details about the infrastructure or operations, please let us know. Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.1%. Comparing base (c3ecdb4) to head (8d6ffa1).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #5263   +/-   ##
=======================================
  Coverage     78.1%   78.1%           
=======================================
  Files          790     790           
  Lines        67909   67911    +2     
  Branches      8224    8225    +1     
=======================================
+ Hits         53036   53039    +3     
+ Misses       14873   14872    -1     

Files with missing lines	Coverage Δ
src/xrpld/overlay/detail/OverlayImpl.cpp	35.1% <100.0%> (+0.1%)	⬆️

... and 3 files with indirect coverage changes

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[bthomee]

@Tokeiito would you be able to sign your commit?

• See https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits for the official documentation. Although if you use something like 1Password, you can generate an SSH key there and configured that one to sign the commits.
• To amend an earlier unsigned commit and sign it, this set of instructions is useful: https://dev.to/za-h-ra/git-fixing-unsigned-gpg-commits-phn.

[bthomee]

@Tokeiito Apologies for the delay. Can you please pull in the latest changes from the develop branch & affirm this PR is ready to be merged? Once done, I'll go ahead and do so.

[Tokeiito]

@bthomee newest changes were merged. PR can be merged.