feat: add format_text helper for unified styling

[githubuser16384]

Description

Added a new format_text() helper for unified application of foreground colors, background colors, and text styles in a single API call.

This improves usability by eliminating deeply nested styling calls such as bold(underline(red("text"))) and provides a cleaner, more intuitive interface while preserving compatibility with the existing API.

Implemented support for:

• Named foreground and background colors
• ANSI integer color codes
• Single or multiple text styles
• Configurable reset behavior
• Validation for invalid colors/styles
• Respect for existing color environment detection (NO_COLOR / forced color behavior)

Also added tests for the new functionality and updated documentation with usage examples.

Fixes #7

Checklist

Before submitting your pull request, please ensure the following:

• I have read the CONTRIBUTING.md guidelines.
• My code follows the project's style guidelines (passed linting).
• I have added tests to cover my changes.
• All existing tests pass.
• Documentation has been updated (for API changes).
• This PR does not introduce any breaking changes to the public API.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update
• Code quality/refactoring (no change in functionality)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[razbuild]

@githubuser16384, nice work. Tested locally, tests pass. Merging. Thanks!