Improvement: TDengine sink adds empty value checking and supports string-formatted timestamps

[huskar-t]

This pull request introduces enhancements and refactoring to the TDengineSink implementation, focusing on improved timestamp handling, stricter validation, and better error reporting.

• Added a new time_setter parameter to TDengineSink, which can accept a column name or a callable to determine the timestamp. It supports int, string (RFC3339 format), or datetime values. A ValueError is raised if both time_key and time_setter are set.
• Added checks to ensure that supertable names are non-empty and fields are present. Raises ValueError if these conditions are not met.
• Enhanced error reporting for overlapping keys between fields and tags, with detailed error messages.
• Updated the documentation to reflect the new time_setter parameter and its behavior. Clarified the behavior of time_key and added notes about potential exceptions.

[huskar-t]

Added retry mechanism

[tim-quix]

Linters need to be run/applied. Might be easier to do ourselves post-merge?

[huskar-t]

Fixed the formatting issues.