Add feature of Replace-by-fee for tx-pool

[chenyukang]

Code review is in #4079

What problem does this PR solve?

Add feature of Replace-by-fee for tx-pool.

Fixes #3734

Problem Summary:

What is changed and how it works?

What's Changed:

This RBF feature enables users to replace a transaction with a higher fee rate when pending in tx-pool, which is useful when the transaction is stuck in the tx-pool:

• Add min_rbf_rate in ckb.toml with default value 1500, which means the minimum extra fee rate for RBF, the unit is shannons/KB
• Add fields fee and min_replace_fee in get_transaction, which means the the minimal fee need to pay for RBF for a specific transaction
• min_replace_fee = sum(replaced_tx_fee) + (min_rbf_rate * size)
• The replaced transaction will be removed from tx-pool and with the status Rejected.

Related changes

• PR to update owner/repo:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code ci-runs-only: [ quick_checks,linters ]

Side effects

• Performance regression
• Breaking backward compatibility

Release note

Title Only: Include only the PR title in the release note.
Note: Add a note under the PR title in the release note.