feat(er): add in-product enablement support (#13610)

We add in-product enablement support for Exception Replay.

## Checklist
- [ ] PR author has checked that all the criteria below are met
- The PR description includes an overview of the change
- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
- The PR description notes risks associated with the change, if any
- Newly-added code is easy to change
- The change follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
- The change includes or references documentation updates if necessary
- Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [ ] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
- Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
- Testing strategy adequately addresses listed risks
- Newly-added code is easy to change
- Release note makes sense to a user of the library
- If necessary, author has acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment
- Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)

Author: P403n1x87

ddtrace/debugging/_products/exception_replay.py

@@ -1,3 +1,5 @@
+import enum
+
 from ddtrace.debugging._config import er_config as config
 
 
@@ -9,23 +11,41 @@ def post_preload():
     pass
 
 
+def _start():
+    from ddtrace.debugging._exception.replay import SpanExceptionHandler
+
+    SpanExceptionHandler.enable()
+
+
 def start():
     if config.enabled:
-        from ddtrace.debugging._exception.replay import SpanExceptionHandler
-
-        SpanExceptionHandler.enable()
+        _start()
 
 
 def restart(join=False):
     pass
 
 
+def _stop():
+    from ddtrace.debugging._exception.replay import SpanExceptionHandler
+
+    SpanExceptionHandler.disable()
+
+
 def stop(join=False):
     if config.enabled:
-        from ddtrace.debugging._exception.replay import SpanExceptionHandler
-
-        SpanExceptionHandler.disable()
+        _stop()
 
 
 def at_exit(join=False):
     stop(join=join)
+
+
+class APMCapabilities(enum.IntFlag):
+    APM_TRACING_ENABLE_EXCEPTION_REPLAY = 1 << 39
+
+
+def apm_tracing_rc(lib_config, _config):
+    if (enabled := lib_config.get("exception_replay_enabled")) is not None:
+        should_start = (config.spec.enabled.full_name not in config.source or config.enabled) and enabled
+        _start() if should_start else _stop()

releasenotes/notes/feat-er-in-product-enablement-253418007f82a19b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    exception replay: added in-product enablement support.