feat(cli): add optional field for scope

[KeisukeYamashita]

Signed-off-by: KeisukeYamashita 19yamashita15@gmail.com# Why

Resolves: #355

In some cases, scope can be optional, but users may want to apply an allow list if a value is provided.
Currently, the scope-empty and scope are exclusive, and this policy can be configured.

Summary by CodeRabbit

• New Features

  • Introduced an optional attribute for scopes, allowing flexibility in commit messages.
  • Updated default configuration for scopes to include the optional field.

• Documentation

  • Enhanced clarity and structure of the scope.md document.
  • Added examples for optional scopes, improving user understanding of configuration options.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes introduce a new boolean field, optional, to the Scope struct, allowing for the absence of a scope when this field is set to true. The validate method has been adjusted to accommodate this new functionality. Additionally, the documentation for scopes has been updated to clarify the configuration options, including the new optional attribute and its implications for commit messages.

Changes

File	Change Summary
src/rule/scope.rs	Added optional: bool field to Scope, updated default implementation, modified validate method, and added test cases for the new field.
web/src/content/docs/rules/scope.md	Enhanced clarity of the document regarding configuration options, added a section for optional scopes, and corrected YAML formatting.

Assessment against linked issues

Objective	Addressed	Explanation
Allow empty scope, but if scope exists must be listed in config (Issue #355)	✅

🐰 In the fields of code, I hop with glee,
A new optional field, as bright as can be!
With scopes now flexible, oh what a delight,
Commit messages dance, both day and night!
So let’s code together, with joy and with cheer,
For every new feature, our vision is clear! 🌟

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