feat: Implemented transaction selection time of high score transactions

[Shivang14d04]

PR description

This PR adds the time spent selecting high-scored transactions during block creation.

This change adds a new timing metric, txsSelectionHighScore, which is measured during transaction pool selection and logged alongside existing block creation timing metrics.

Fixed Issue(s)

fixes #9179

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[macfarla]

@Shivang14d04 thanks for the PR - can you rebase off latest main please, then we can get someone to review. Thanks!

[Shivang14d04]

Hi @macfarla, I’ve rebased the PR on the latest main. The branch is now ready for review.

[ahamlat]

@ahamlat is this what you want? from the description I could assume that you only want the time spent processing tx with the highest score

I think this implementation doesn't address the issue I created. The idea of the issue is to have the "real selection time" in case of selection timeout. Let's say a block of 10 transactions was built where each transaction took 1ms to be selected, and the 11th transaction was too slow to be selected and triggered timeout :

• Tx 1 selection time : 1 ms
• Tx 2 selection time : 1 ms
• Tx 3 selection time : 1 ms
• ..
• Tx 10 selection time : 1 ms
• Tx 11 Timeout during transaction selection

In this, I would like to have the time it took to select tx 1 to tx 10, instead of just having 1.8 second in case of a 2 seconds block time.

@Shivang14d04 Your implementation should be reviewed to address the case I shared.