feat(cli): add footers empty rule

Walkthrough

The recent updates enhance the commit message validation system by introducing a new rule for ensuring footers are included in messages. A dedicated module and struct for footer validation have been added, along with a test for parsing multiline commit messages. Documentation for the new rule clarifies expectations for developers, promoting best practices in commit message formatting.

Changes

Files	Change Summary
`src/git.rs`	Added a test function `test_footer_with_multiline_body_parse_commit_message` to validate parsing of multiline commit messages, enhancing coverage for the `parse_commit_message` function.
`src/rule.rs`	Introduced a new module `footers_empty` and an optional field `footers_empty` in the `Rules` struct to handle footer validation. Updated the `Default` implementation accordingly.
`src/rule/footers_empty.rs`	Implemented the `FootersEmpty` struct for footer validation with methods for message generation and violation checking. Added tests for validating the rule's functionality.
`web/src/content/docs/rules/footers-empty.md`	Created documentation for the "Footers Empty" rule, detailing its purpose and providing examples of correct and incorrect commit messages.

Sequence Diagram(s)

sequenceDiagram
    participant Developer
    participant CommitMessageParser
    participant FooterValidator

    Developer->>CommitMessageParser: Submit commit message
    CommitMessageParser->>FooterValidator: Validate footers
    FooterValidator-->>CommitMessageParser: Return validation result
    CommitMessageParser-->>Developer: Provide feedback

Poem

🐇 In the world of commits, so neat and bright,
A rule for footers now takes flight!
With messages parsed, both long and wide,
Let no empty footer dare to hide!
So hop along, with code so fine,
For clearer commits, let our work shine! 🌟

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KeisukeYamashita / commitlint-rs