Added --text parameter for matching with keywords within files

[YakovAU]

No description provided.

[ODAncona]

Hello,
Thanks for your contribution and the new feature.

Here's are the requested changes:

1. The should_include_file is based on include and exclude glob pattern. Thus, a new separate function should be made to check for your text filter. Then your function should be integrated into the path.rs file.
2. The codebase must be updated to the latest version
3. The unit test should verify the new function. E.g file_contains_text