bugfix(auto-instrumentation): attach OTLPHandler to root logger

[srikanthccv]

Description

Fixes #2448

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

[moriyoshi]

I don't think this patch is good for everyone. This forces the root logger to have the SDK's LogHandler instance no matter if auto instrumentation is applied for logging, more specifically even if it's explicitly disabled through OTEL_PYTHON_DISABLED_INSTRUMENTATIONS, _init_logging() just leaves the uncalled-for log handler set and hence the logger won't be reset by logging.basicConfig() because the logger initialization is done implicitly within the first call to logging.getLogger(). I strongly recommend this patch should be reverted and reconsider how to handle this situation.