feat: add support with rocket_okapi and update crate dependencies

[sawa-ko]

This pull request includes several updates to dependencies and features in the project. The most important changes include updates to GitHub Actions workflow files, dependency version upgrades in Cargo.toml files, and the addition of new features and traits in the src/lib.rs file.

GitHub Actions Workflow Updates:

• Updated actions/checkout to version v4.2.2 in .github/workflows/build.yml and .github/workflows/lint.yml [1] [2].
• Updated Swatinem/rust-cache to version v2.7.5 in .github/workflows/build.yml and .github/workflows/lint.yml [1] [2].
• Updated codecov/codecov-action to version v5.1.1 in .github/workflows/lint.yml.

Dependency Version Upgrades:

• Upgraded rocket to version 0.5.1 and validator to version 0.19.0 in Cargo.toml and example Cargo.toml files [1] [2] [3] [4].

New Features and Traits:

• Added new features rocket_okapi and parser_errors in Cargo.toml.
• Implemented OpenApiFromData and OpenApiFromForm traits for Validated structs in src/lib.rs.
• Added error handling for data parsing errors in FromData implementation for Validate.

These updates improve the project's dependency management, enhance error handling, and add new functionality for OpenAPI support.