Remove omexlogger

[Gnol-VN]

This PR is to:

1. Remove OmexLogger and its relatives
2. Add an action to support InitializationLogger, so consumers can supply their own logger to know if the host is built successfully or not
3. Remove [Obsolete] attributes

Why did I add an action to configure the under-the-hood InitializationLogger?

The BuildState(less/ful)Service() will call BuildServiceFabricService(), and this is the only place we do logging just before host is really built.

To receive Initialization logs, the last guard is having InitializationLogger in consumer's Program.cs. However, this has to ensure all consumers use

try { } catch { OTELInitLogger.log(exception) }

I idealize, instead of assuming consumer having this try catch pattern in all of their Program.cs files, this action should be configured in a Shared library, or Shared SDK. For handy experience, consumers within an organisation just need to import the shared library and they do not need to do the try/catch above to get logs from InitializationLogger

[artempushkin]

Blocking to get time for proper review.

[artempushkin]

Did you forget to actually remove OmexLogger?

[Gnol-VN]

Did you forget to actually remove OmexLogger?

Lol, Absolutely right haha