declarative config: span stacktrace

Port StackTraceAutoConfig to declarative config

Blocked by https://github.com/open-telemetry/opentelemetry-java/pull/7480 : uses `otel.java.experimental.span-stacktrace` - see https://github.com/open-telemetry/opentelemetry-java-contrib/issues/2013
