feat: Add DelegateWithActions

[snawaz]

It's the first version of DelegateWithActions instruction, along with following:

• offchain and onchain APIs to create PostDelegationInstruction and PostDelegationActions.
• Split the program crate, extracting out dlp-api that contains encryption and the instruction builders.
• It is far from being perfect. Lots of improvements, and error propagations are possible and must be done as soon as the entire e2e flow works!

Summary by CodeRabbit

Release Notes

• New Features

  • Added delegate_with_actions instruction enabling delegated accounts to execute post-delegation actions with optional encryption support.
  • Introduced encryption/decryption framework for protecting delegated action payloads.
  • Implemented compact instruction encoding for efficient on-chain representation.

• Infrastructure

  • Reorganized instruction builders into dedicated API package.
  • Added comprehensive automated code analysis and linting configuration.
  • Enhanced feature flag organization for encryption and processing capabilities.