feat: downstream foldable intent import

[jonasXchen]

Summary by CodeRabbit

• Refactor
  • Commit and CommitAndUndelegate intent builders now include three new public inherent methods: build(), build_and_invoke(), and build_and_invoke_signed(). These changes expose build and invoke functionality directly on the builder types. The public API surface has been extended to provide more convenient access to these operations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between df2c561 and 856fef5.

📒 Files selected for processing (2)

• rust/sdk/src/ephem/cau_intent_builder.rs
• rust/sdk/src/ephem/commit_intent_builder.rs

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📝 Walkthrough

Walkthrough

The pull request adds inherent methods to two builder classes in the Rust SDK's ephemeral module. The CommitAndUndelegateIntentBuilder and CommitIntentBuilder classes each receive three new public methods: build(), build_and_invoke(), and build_and_invoke_signed(). These methods forward directly to their corresponding implementations in the FoldableIntentBuilder trait. The changes include necessary imports for IntentInstructions and ProgramResult. The underlying implementation logic remains unchanged; only the callable API surface is modified to provide direct access to these methods without requiring trait imports.

Suggested reviewers

• taco-paco
• GabrielePicco

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/downstream-foldableintent-import

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[taco-paco]

That defeats the purpose of Foldable builders, let's see a better solution. Additionally, build_and_invoke should be supported for ActionBuilder as well.
This highlight how much boilerplate there will be without Foldable traits.