chore: bump the pubsub validation queue length to 256

[hanabi1224]

Summary of changes

Ports filecoin-project/lotus#13176

Changes introduced in this pull request:

• Ports WithMessageIdFn as well. (This was introduced 5 years ago in Lotus and is not made for F3, porting it just to get parity)

Reference issue to close (if applicable)

Closes #5743

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

nit: this also ports the WithMessageIdFn; it'd be nice to include this at least in this PR title or description to facilitate future archaeology.

Q: what's the effect on the node if either of those changes are not ported?

[masih]

Please note, we are investigating what the smallest effective size can be for validation queue size.

Please do not merge this PR until this is determined for Lotus in the corresponding PR.