Adding padding to ShankType and allowing multiple padding fields

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Summary by CodeRabbit

• New Features

  • Added padding attribute support for struct field definitions, enabling explicit padding specification in type definitions.
  • Removed constraint limiting structs to a single padded field, allowing multiple padding fields per struct.

• Tests

  • Added test fixtures and test cases validating padding behavior in struct types.

Walkthrough

Introduces #[padding] attribute support to the Shank IDL system. Adds test fixtures for a struct with padding fields, includes a test case to verify parsing correctness, updates the ShankType derive macro to recognize the padding attribute, and removes single-padding-field constraints from account extraction logic.

Changes

Cohort / File(s)	Summary
Padding Test Fixtures shank-idl/tests/fixtures/types/padding.json, shank-idl/tests/fixtures/types/padding.rs	New test fixtures defining a StructTypeWithPadding struct with a count field (u8) and a 3-byte padding array annotated with #[padding] attribute in both JSON and Rust formats.
Padding Type Test shank-idl/tests/types.rs	Added type_padding() test function that parses the padding fixture and validates it matches the expected IDL output, following the established test pattern.
ShankType Derive Macro Update shank-macro/src/lib.rs	Updated ShankType derive macro attribute list to include padding alongside existing attributes (idl_name, idl_type, skip, pod_sentinel).
Account Extraction Logic shank-macro-impl/src/account/extract_accounts.rs	Removed HashSet-based padding field count validation and the single-padding-field constraint from verify_account_struct. Simplified imports and adjusted test assertions to reflect that multiple padded fields are now permissible.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• create #[idl_type(..)] macro for manual typing #71: Adds padding attribute support to ShankAccount derive macro, complementing this PR's updates to ShankType.
• Skip and rename for Shank types and account fields #73: Modifies field attribute handling and representation in derive macros and extraction logic as part of the padding attribute feature implementation.

Suggested reviewers

• danenbm

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided by the author, making it impossible to assess whether it relates to the changeset.	Add a pull request description explaining the changes, their rationale, and any testing performed to help reviewers understand the intent.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main changes: adding padding support to ShankType and removing the single-padding-field constraint.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/moar-padding

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