Add block_transaction_size_limit to ConsensusParameters

[rafal-ch]

Partial implementation of FuelLabs/fuel-core#2133.

This PR adds a new version (V2) of the ConsensusParameters which includes the block_transaction_size_limit parameter.

Checklist

• Breaking changes are clearly marked as such in the PR description and changelog
• New behavior is reflected in tests
• The specification matches the implemented behavior (link update PR if changes are needed)

Before requesting review

• I have reviewed the code myself
• I have created follow-up issues caused by this PR and linked them here

After merging, notify other teams

[Add or remove entries as needed]

• Rust SDK
• Sway compiler
• Platform documentation (for out-of-organization contributors, the person merging the PR will do this)
• Someone else?

[rafal-ch]

Closed in favor of #821