Add new logger with log levels

[timokoessler]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.84483% with 63 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
library/agent/Agent.ts	67.60%	22 Missing and 1 partial :warning:
library/agent/logger/LoggerConsole.ts	28.57%	15 Missing :warning:
library/sinks/Fetch.ts	0.00%	15 Missing :warning:
library/agent/realtime/getConfigLastUpdatedAt.ts	0.00%	5 Missing :warning:
library/helpers/shouldEnableFirewall.ts	0.00%	2 Missing :warning:
library/agent/hooks/wrapExport.ts	85.71%	1 Missing :warning:
library/agent/hooks/wrapNewInstance.ts	92.85%	1 Missing :warning:
library/agent/protect.ts	0.00%	1 Missing :warning:

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