fix: various logger fixes

[bombnp]

Summary

1. All log functions (Info, InfoContext, etc.) now accepts additional parameters as slog.Attr only, instead of any
2. Added nil check in slogx.Stringer to prevent panics when passing nil
3. Updated middlewareErrorStackTrace to use slogx.Stringer instead of slogx.Any for better stacktrace readability and allowing us to cmd + click in terminal to go to source code.

4. Added middlewareDurationHuman to add human-readable field for every duration attribute. Used in GCP and JSON mode where duration is serialized as milliseconds.
5. Force middlewareErrorStackTrace to always be enabled if output is not text
6. Prevent tint attribute from leaking stacktrace into error key (which would duplicate with error_stacktrace key)
7. Added SetLogger function

[Planxnx]

LGTM ✨