Provide support for deprecated auto-configuration classes

[philwebb]

#14412 shows that we need a way to offer deprecated auto-configuration classes. Such classes would not need to actually contain configuration, but would still be valid when used as an exclude or and @AutoConfigureBefore/@AutoConfigureAfter value.

[philwebb]

Prototype work https://github.com/philwebb/spring-boot/tree/gh-14860

[mbhave]

This one looks similar: #6684

[wilkinsona]

We have no need for this at this time. Closing for now.

[mhalbritter]

We talked about that today and decided to resurrect that issue. We have a need for it due to #36544 where we want to rename OpenTelemetryAutoConfiguration to OpenTelemetryTracingAutoConfiguration without breaking users.