v2.1: Fix builtin default cost dependents on migration (backport of #3768)

[mergify]

Problem

Some of builtin programs are being migrated to sbpf, while the rest is being planned for too. Once a builtin program is migrated in a cluster, it's "default cost" defined in BUILTIN_INSTRUCTION_COSTS should be changed to 0.

Summary of Changes

• add public function to fetch correct default cost for builtin program, based on migration feature status
• add BuiltinCost struct to track migration feature ID
• add developer notes to remind to add migration feature ID whenever it becomes available.

Fixes #

---

This is an automatic backport of pull request #3768 done by [Mergify](https://mergify.com).

[mergify]

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Changes to be committed:
	modified:   builtins-default-costs/benches/builtin_instruction_costs.rs
	modified:   core/src/banking_stage/packet_filter.rs
	modified:   runtime/src/bank/builtins/mod.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   builtins-default-costs/src/lib.rs
	both modified:   cost-model/src/cost_model.rs

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[tao-stones]

A prerequisite bp for backporting #3975 to 2.1 (#4091).

Details:

• this, Fix builtin default cost dependents on migration #3768, introduced pub fn get_builtin_instruction_cost(&Pubkey, &FeatureSet) for migration-featuree-awared method of getting builtin program cost (eg: Some(native_cost) for builtins, or Null for migrated-builtin/non-builtins)
• next, Accounting migrating builtin programs default Compute Unit Limit with feature status #3975, built on top of that to set correct default Compute Budget Limit (eg 3K or 200K) for builtin programs based on their migration status.