add TraceLogConfig with customizable TimeKey and ensureConfig method for default initialization

[stringintech]

Description

This PR introduces the TraceLogConfig struct to the tracelog package. The new struct includes a customizable TimeKey field with a default value of "time", allowing flexibility for logging configurations.

Additionally, the ensureConfig method is introduced to ensure that the Config field is initialized with default values if it is nil. Trace methods have been updated to call ensureConfig() to ensure that Config is properly initialized before logging.

References

This PR addresses the issue discussed in Issue #2043.

Feedback Request

Are there any additional key names or configurations that should be considered for inclusion in TraceLogConfig to further enhance customization?

I would appreciate any feedback on whether I am following the correct procedure. Thank you.

[jackc]

LGTM.

Are there any additional key names or configurations that should be considered for inclusion in TraceLogConfig to further enhance customization?

I don't know of any.