Set the default log level for Agent to `INFO` and raise it to `DEBUG` if `dump-logs=true` is provided (#373)

* Set the default log level for Agent to `INFO` and change it to `DEBUG` if `dump-logs=true` is provided

* Remove `Trace` method and replace its calls with `Debug`

* Export logging levels from `logger` by defining functions

* Revert "Export logging levels from `logger` by defining functions"

This reverts commit e554e40f4a16f07bf7b1f2ee4a7d2544a5a5a19d.

* Run `go mod tidy` on agent

* Define a method named `determineLogLevel`