Need some way to config the default log level

[tomwang57]

Is your feature request related to a problem? Please describe.
After launch my phoenix app, the newrelic debug messages are output all the time:

[DEBUG] - 2023-11-06 20:10:57 - Completed Custom Event harvest - size: 4, seen: 4, max: 83
[DEBUG] - 2023-11-06 20:10:57 - Completed Transaction Event harvest - size: 0, seen: 0, max: 83
[DEBUG] - 2023-11-06 20:10:57 - Completed TelemetrySdk.Logs harvest - size: 0, seen: 0, max: 5000
[DEBUG] - 2023-11-06 20:10:57 - Completed TransactionError Event harvest - size: 0, seen: 0, max: 8
[DEBUG] - 2023-11-06 20:11:02 - Completed TelemetrySdk.Span harvest - mode: sampling, size: 0, seen: 0, max: 5000
[DEBUG] - 2023-11-06 20:11:02 - Completed TelemetrySdk.Logs harvest - size: 0, seen: 0, max: 5000
[DEBUG] - 2023-11-06 20:11:02 - Completed Custom Event harvest - size: 2, seen: 2, max: 83
[DEBUG] - 2023-11-06 20:11:02 - Completed Transaction Event harvest - size: 0, seen: 0, max: 83
[DEBUG] - 2023-11-06 20:11:02 - Completed TransactionError Event harvest - size: 0, seen: 0, max: 8
[DEBUG] - 2023-11-06 20:11:07 - Completed TelemetrySdk.Span harvest - mode: sampling, size: 0, seen: 0, max: 5000
[DEBUG] - 2023-11-06 20:11:07 - Completed Custom Event harvest - size: 6, seen: 6, max: 83
[DEBUG] - 2023-11-06 20:11:07 - Completed TelemetrySdk.Logs harvest - size: 0, seen: 0, max: 5000
[DEBUG] - 2023-11-06 20:11:07 - Completed Transaction Event harvest - size: 0, seen: 0, max: 83
[DEBUG] - 2023-11-06 20:11:07 - Completed TransactionError Event harvest - size: 0, seen: 0, max: 8
[DEBUG] - 2023-11-06 20:11:11 - Completed Span Event harvest - size: 0, seen: 0, max: 1000

And i read the doc and can't find a way to disable it, like change the log level.

Describe the solution you'd like
The agent need to provide some way to deal with it, like some way to change log level

Describe alternatives you've considered
Or provide a way just to disable logging

My used version:
new_relic_agent: 1.27.8

[binaryseed]

With #455 and #402, you should be able to use standard Elixir Logger mechanisms for this

Even before 455, you can tell the agent to use Elixir Logger via config - https://hexdocs.pm/new_relic_agent/NewRelic.Config.html#logger/0