change TxPreEvent to TxsPreEvent

[gzliudan]

Proposed changes

This PR is from all: change TxPreEvent to TxsPreEvent with minor modifications, below is the original description:

Currently, when a transaction is promoted, a TxPreEvent will be pushed to subscribers immediately.

While when the number of new transactions received is large, there are too many TxPreEvent will be pushed leads to txFeed lock resource contention.

So this PR replace all TxPreEvent to TxsPreEvent. So that we can push a batch of new promoted txs together. It will help in these scenario：

• Block reorganization(a bunch of transactions will be re-injected to txpool)
• Improve transaction forwarding efficiency(Send a batch of transactions to peers instead of single one)
• Relieving pressure on the system from websocket pending transaction subscriptions(Prevent slower socket write speeds from blocking txfeed)

Types of changes

What types of changes does your code introduce to XDC network?
Put an ✅ in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

Put an ✅ in the boxes that apply

• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

[liam-lai]

Thanks!