cli: Add priority fees to idl commands

[andreihrs]

• add optional priority fee argument
• get max between recommended priority fee from the client and priority fee passed, so that txs have a higher chance to go through
• add retry on write buffer, so the operation doesn't fail on blockhash expired/transaction expired midway
• make the buffer size small on writing, so it doesn't fail on tx size too big when adding the compute budget unit fee instruction

[vercel]

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[acheroncrypto]

We definitely need priority fees and retry logic, so thank you for working on this!

[acheroncrypto]

There is one small issue, other than that, this looks great!

Before we merge, could you note this change in the CHANGELOG?

[acheroncrypto]

Thank you!

[Henry-E]

It would be helpful to add some examples to the docs or even just here about what the usage looks like

[acheroncrypto]

Yeah, we can do that (after the next release because the doc website updates live), I'll also note this in the release notes. The usage is pretty simple e.g. anchor idl init --priority-fee ...

Most of the time, you wouldn't even need to specify this argument since we use the median priority fee by default. Also the fees are broken i.e. increasing the priority fee after a certain point doesn't make your transaction more likely to land.