reafactor(Agave 2.0): Remove All Instances of `getFees` and `getFeeCalculatorForBlockhash`

[0xIchigo]

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This PR aims to start addressing #2859 by eliminating all instances of getFees and getFeeCalculatorForBlockhash as they'll be removed in Agave 2.0

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Latest commit: 3f853aacfef53d638b8366c0f1a5f442daa633ea

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[steveluscher]

Thanks for this!

Before you go too far down this rabbit hole, I've started to have a few second thoughts here.

1. Responsibly removing these methods would require a major version bump, which would take legacy web3.js to 2.0.
2. The new library that we actually intend on releasing as web3.js 2.0 already has these methods gone.

I think maybe we just cut our losses for legacy, and close #2859 by releasing the new library. Two birds, one stone.

[0xIchigo]

No worries @steveluscher! I figured I'd start with this PR and go from there. Should I close this PR then or leave it open for the time being?

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