Allow passing a non-SDK `LoggerProvider` to the SDK `EventLoggerProvider`

Here:

https://github.com/open-telemetry/opentelemetry-python/blob/a7fe4f8bac7fa36291c6acf86982bbb356e3ae6d/opentelemetry-sdk/src/opentelemetry/sdk/_events/__init__.py#L68-L70

LoggerProvider is from opentelemetry.sdk._logs, not the API opentelemetry._logs. This is needed for things like this:

https://github.com/open-telemetry/opentelemetry-python/blob/a7fe4f8bac7fa36291c6acf86982bbb356e3ae6d/opentelemetry-sdk/src/opentelemetry/sdk/_events/__init__.py#L85-L86

I've defined a subclass of the API LoggerProvider. A subclass of the SDK provider class wouldn't make sense in my case. I'd like to pass instances of my subclass to EventLoggerProvider. In addition the logger provider defaults to get_logger_provider() which might not be an SDK provider, so the types are buggy.

Most of the logic isn't tied to the SDK LoggerProvider. Where it is, it could do something like:

if isinstance(self._logger_provider, SDKLoggerProvider):
    self._logger_provider.shutdown()

or just:

try:
    self._logger_provider.shutdown()
except (AttributeError, TypeError):
    pass

Start in opentelemetry-sdk/src/opentelemetry/sdk/_events/init.py at the LoggerProvider import and EventLoggerProvider constructor. Compare the API LoggerProvider contract with the SDK provider assumptions, including shutdown handling. Done means an API LoggerProvider subclass can be passed without SDK-specific type failures, while SDK providers retain their existing behavior.