Summary of Changes

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This pull request focuses on refactoring the is_bit_valid tests within the zerocopy-derive crate. The primary goal is to enhance the clarity and maintainability of the test suite by abstracting repetitive test setup and assertion logic into a reusable helper function. This change improves the overall structure of the tests without altering the functional behavior of the is_bit_valid implementations.

Highlights

• New Test Helper Function: A new public helper function, test_is_bit_valid, has been introduced in zerocopy-derive/tests/include.rs. This function centralizes the common logic for testing the is_bit_valid method of types implementing TryFromBytes, including pointer manipulation and assertion.
• Test Refactoring: Existing is_bit_valid tests in zerocopy-derive/tests/struct_try_from_bytes.rs and zerocopy-derive/tests/union_try_from_bytes.rs have been refactored to utilize the new test_is_bit_valid helper. This significantly reduces boilerplate code and improves test readability and maintainability.
• Trait Derives Added: To accommodate the new test helper's requirements, imp::Immutable and imp::IntoBytes derives were added to several test structs and unions (e.g., One, Two, MaybeFromBytes) in the struct_try_from_bytes.rs and union_try_from_bytes.rs test files.
• Consolidated Test Cases: Some redundant test cases, such as two_bad in both struct_try_from_bytes.rs and union_try_from_bytes.rs, were removed and their logic integrated into the main two test using the new helper, further streamlining the test suite.

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