Is your feature request related to a problem? Please describe.

uses AutoConfigurationCustomizerProvider - which is not used with file config

@jack-berg what is the reason for not supporting this callback?

Describe the solution you'd like

Use DeclarativeConfigurationCustomizer instead

https://github.com/open-telemetry/opentelemetry-java/blob/000fd0f20919efbcb7e39e1ca493a246e0eb3dde/sdk-extensions/incubator/src/main/java/io/opentelemetry/sdk/extension/incubator/fileconfig/DeclarativeConfigurationCustomizer.java#L12

Tasks:

• spring starter: add thread details instrumentation / configure logging span exporter #14117
• Spring starter thread details #14449
• Declarative config: Agent tracer/thread details config #14127
• add declarative config span logger #14591
• declarative config: add thread details resource processor #14564
• span logging with spring starter (declarative config and legacy) will be done as part of Spring starter declarative config #14062 (which is milestone 2)