This release adds experimental exception profiling to the profiler. This is off by default. Enable it with the environment variable DD_PROFILING_EXPERIMENTAL_EXCEPTION_ENABLED=1 or INI setting datadog.profiling.experimental_exception_enabled=1.

In Application Security Management, this release introduces the latest version of the WAF v1.14.0 and the latest ASM ruleset v1.8.0, as well as a fix to ensure runtime IDs reported by the remote configuration client are always valid and consistent with those reported by the Tracer.

## Tracer
### Added
- Add Drupal Integration #2188
- Implement sidecar tracing #2234
- This functionality is currently experimental and guarded behind a configuration option DD_TRACE_SIDECAR_TRACE_SENDER=1 or INI setting datadog.trace.sidecar_trace_sender=1. It replaces the sending of traces through a dedicated thread.

### Fixed
- Do not emit a deprecated diagnostic for DD_LOGS_INJECTION #2253
- Set peer.service as dddbs when available #2260
- Fix toggling datadog.trace.enabled with perdir configuration #2269
- Enable auto flush for artisan commands #2270

### Internal changes
- Keep doctrine/dbal to major version 2 in symfony 5.2 tests #2254
- docs: Explain minimum and nice-to-have from LLVM #2264

## Profiling
### Added
- Add exception profiling #2197, #2262
- Do not disable allocation profiling on fixed PHP versions with active JIT #2246

### Fixed
- Add missing `end_timestamp_ns` to string compilation event #2251
- store customized heap #2261
- remove ?BETA? in `datadog-setup.php` as the profiler is not beta anymore #2278
- use-after-free with Closure trampolines #2280

### Internal changes
- add tests for timeline #2192

## Application Security Management (0.14.0)
### Added
- Add default processors and scanners DataDog/dd-appsec-php#298
- Exchange more types between extension and helper DataDog/dd-appsec-php#299
- API security configuration settings DataDog/dd-appsec-php#300

### Fixed
- Propagate Runtime IDs and keep a valid pool in the RC client DataDog/dd-appsec-php#301

### Internal changes
- Add nginx container to integration tests DataDog/dd-appsec-php#294
- Upgrade WAF to 1.14.0 DataDog/dd-appsec-php#295
- Upgrade tracer to v0.91.0 and remove master build downloads DataDog/dd-appsec-php#296
- Upgrade ruleset to 1.8.0 DataDog/dd-appsec-php#302
- Merge appsec repository as subtree #2267