Add options to NewLogger function to encode time in iso8601 format and provide a different caller skip if necessary to the logger

### What problem are you facing?

I would like for the `NewLogger()` function to have a couple more options to initialize logger for the functions as per need:
- allow encoding time in iso8601 format
- optionally allow setting a different caller skip if necessary

### How could Crossplane help solve your problem?

Update `NewLogger()` function to take in options to handle encoding time and setting a different caller skip.

Proposed changes made: #145