Add regex option to ResponseMatcher

[MindPatch]

This PR adds the ability to use regular expressions when matching a response body in the ResponseMatcher struct. The new ResponseMatcher options are multi_line, case_insensitive, ignore_whitespace, unicode, octal, and dot_matches_new_line. These options can be passed in using a Lua table when creating a ResponseMatcher object, or can be set using the options method.

The commit also includes modifications to the ResponseMatcher implementation to enable regex matching. A new is_regex parameter is added to the match_and_body method to indicate whether a regex pattern should be used for matching. The method now builds a Regex object using the provided regex pattern and the new ResponseMatcher options, and then checks whether the pattern matches the provided response body.

Finally, this commit includes updates to the UtilsEXT implementation to set default options for the ResponseMatcher object when creating it in the Lua runtime.