Extract fee-structure crate

[kevinheavey]

Problem

solana_sdk::fee imposes a solana_sdk dependency on solana_svm and solana_compute_budget

Summary of Changes

• Move to its own crate and re-export with deprecation in solana_sdk. I've named the new crate solana-fee-structure based on the top level doc comment for fee.rs. solana-fee is already taken.
• Make serde optional in the new crate
• Add doc_auto_cfg

[febo]

Looks good – just one micro nit.

[febo]

One more question. solana-fee at the moment depends on the solana_sdk::fee::FeeDetails. Should that be updated to point to this new crate on this PR or the plan is to do it in a separate PR?

[kevinheavey]

Separate PR :)

I try to avoid touching other crates in these PRs ever since I had to rebase #2172 13 times

[febo]

Sounds good – @yihau could we please accept the crate ownership?

[yihau]

✅