Adding `args`, `kwargs`, and `raw_message` to log records

[sentrivana]

Hey, I wanted to explore whether you'd consider adding additional data to log records that get passed to handlers, namely:

• args
• kwargs
• raw_message (or maybe template): the raw, unformatted message before any color formatting or interpolation is applied

Basically, these would just be the args, kwargs and message that the Logger._log function receives, verbatim.

The motivation is that this would allow observability tools to hook into Loguru logs better -- I'm from Sentry and we're currently working on adding logs support to our Loguru integration.

If this sounds ok, I'm happy to PR the change.

[Delgan]

Hey @sentrivana. Thanks for reaching out and improving Loguru's integration with Sentry!

Initially, I assumed that downstream log consumers should not care about the raw message and formatting arguments. However, I guess this information is actually important for tools that regroup logs based on the static template of the message, prior to interpolating dynamic values.

I agree this is something that could be added to the record dict. I'll probably add a new template field. 👍