Support Template Strings for log messages (#1397)

[TurtleOrangina]

Implements support for python 3.14 template strings:

logger.debug(t"obj = {large_obj}")

Will evaluate lazily, e.g. if the minimum log level means no debug messages are logged, the large_obj will not be converted to string.

[Delgan]

Thank you for this initial implementation. This seems like an excellent solution to compensate for the planned removal of **kwargs as a formatting argument.

Please allow me not to merge this PR immediately because I want to think a little about possible integrations of t-strings, but it seems very fine to me as is.

[TurtleOrangina]

Of course! Let me know if you want any changes.