feat: Autofix spec-char-escape rule

[coliff]

This pull request introduces a new auto-fix for the spec-char-escape rule, updates the extension's embedded HTMLHint version, and includes several documentation and configuration updates to enhance usability and debugging. Below are the most important changes grouped by theme:

New Feature: Auto-fix for spec-char-escape

• Added the createSpecCharEscapeFix function to generate auto-fix actions for escaping special characters (<, >) in HTML content.
• Integrated the new auto-fix into the createAutoFixes function to handle diagnostics for the spec-char-escape rule.

Documentation Updates

• Updated the README.md to include spec-char-escape in the list of supported auto-fixes and updated the embedded HTMLHint version to 1.6.3. [1] [2]
• Added a changelog entry for version 1.10.2, documenting the new auto-fix and the renamed output channel.

Debugging and Usability Improvements

• Renamed the extension's output channel to "HTMLHint Extension" for better clarity in debugging logs.

Version and Configuration Updates

• Bumped the extension version to 1.10.2 in package.json.
• Updated the .htmlhintrc configuration to include attr-value-no-duplication and reordered rules for consistency.

Test Updates

• Added a test case in test-autofixes.html to validate the new spec-char-escape auto-fix functionality.

[gemini-code-assist]

Code Review

This pull request introduces an autofix feature for the spec-char-escape rule, focusing on < and > characters. The changes include the core autofix logic, updates to documentation, version bumps, and test enhancements. Key areas for potential improvement include simplifying a position calculation within the new autofix function. Overall, this is a valuable addition to the extension's capabilities.