Add a transaction prioritization API to the JavaScript library (@solana/web3.js)

[tao-stones]

Problem

JavaScript library to utilize prioritization fee

Proposed Solution

TBD

[steveluscher]

Ah, I was hoping for some sort of guidance about the right API for this :)

In the meantime, I discovered that a compute budget instruction helper was added by @philcchen in solana-labs/solana#24086, so maybe that's all the API we need or want?

Open to thoughts on whether:

1. that's enough, or
2. whether we should elevate this to the level of the Transaction class, or
3. whether we should create a helper prioritizeTransaction(transaction: Transaction, additionalFee: number): Transaction that does the work of prepending the right instruction to an existing transaction.

Almost certainly 3, right?

cc/ @jordansexton, @jstarry, @jnwng.

[tao-stones]

I discovered that a compute budget instruction helper was added by @philcchen in solana-labs/solana#24086, so maybe that's all the API we need or want?

Looks like solana-labs/solana#24086 ported earlier version of ComputeBudgetInstruction, probably needs a refreshment, at least add support of SetComputeUnitPrice

[jnwng]

whether we should create a helper prioritizeTransaction(transaction: Transaction, additionalFee: number): Transaction that does the work of prepending the right instruction to an existing transaction.

this sounds right to me—positionally, a priority fee is going to end up being different than the deterministic fees-per-signature as well as any rent exemption fees. plus since we're mutating the transaction we're gonna return a new Transaction anyway

[github-actions]

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