test: add macro prop tests, move existing macro tests into a separate dir

[ananas-block]

Extract Inline Tests to Centralized Test Directory

1. Create 9 new test files in light_pdas_tests/ - Extract ~116 unit tests from inline #[cfg(test)] blocks to dedicated test modules (light_account_tests.rs, seed_extraction_tests.rs, parsing_tests.rs,
   derive_tests.rs, light_compressible_tests.rs, light_account_keywords_tests.rs, visitors_tests.rs, crate_context_tests.rs, shared_utils_tests.rs)
2. Consolidate fuzzing and property tests - Move fuzz targets from standalone sdk-libs/macros/fuzz/ directory into centralized light_pdas_tests/ directory (fuzz_tests.rs, e2e_prop_tests.rs,
   keywords_prop_tests.rs, parse_prop_tests.rs, prop_tests.rs, shared_utils_prop_tests.rs)
3. Update test visibility - Change 9 internal functions and 2 types from private/pub(super) to pub(crate) to allow access from test modules (parse_light_account_attr, LightMintField, check_light_account_type,
   call_has_ctx_arg, has_derive_attribute, FieldExtractor, etc.)
4. Reorganize module visibility - Make light_pdas/accounts/light_account, mint, and light_pdas/program/crate_context, parsing, visitors modules pub(crate) for testing access
5. Update dependencies - Add proptest and rand to light-sdk-macros Cargo.toml for comprehensive test infrastructure
6. Fix clippy warnings - Resolve let_and_return and cmp_owned clippy errors in test files
7. Remove old fuzz infrastructure - Delete separate fuzz directory (sdk-libs/macros/fuzz/) and Cargo configuration; use unified testing in light_pdas_tests
8. Update test module index - Modify light_pdas_tests/mod.rs to include all 9 new unit test modules alongside existing property/fuzz tests

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch jorrit/test-light-sdk-macros

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