- Added support for a new `Metadata` field in the `Options` struct to allow passing custom data to hooks, enhancing flexibility in context management.
- Updated the `ToMap` and `OptionsFromMap` methods to include serialization and deserialization of the `Metadata` field.
- Enhanced the test case structure to include an `Options` field, allowing for per-test-case configuration, including metadata and skip options.
- Updated documentation to reflect the new `options` and `metadata` fields, providing clear examples for users on how to utilize these features in test cases.
- Introduced an `assert` field in the test case structure to allow for custom assertion rules, providing flexibility in output validation.
- Defined various assertion types, including `equals`, `contains`, `not_contains`, `json_path`, `regex`, and `script`, to cater to different validation needs.
- Updated the test runner to utilize the new assertion mechanism, replacing the previous expected output validation with a more robust asserter.
- Enhanced documentation in DESIGN.md to include detailed examples and explanations of the new assertion capabilities, improving clarity for users.
