Tweaking asset signer methodology

[blockiosaurus]

Instead of using the authority as the identity, setting the asset signer as the identity via a NoopSigner. This allows it to be defaulted without needing to use getEffectiveSigner or do any transaction rewriting. Both the payer and identity can be the asset signer.

The one caveat is that we do need to manually override the feePayer on the transaction in the send instruction. This is due to how we handle the payer, where we conflate the instruction payer (rent on accounts) with the transaction payer. We want the asset signer to be the one paying rent and fees, we only want the authority signer to be paying transaction fees. So we need this override.

[coderabbitai]

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