datadog_trace 1.4.0

## Tracer

The default value for datadog.trace.cli_enabled is now set to true (except for composer), meaning that CLI processes will be traced by default.

### Added
- Dynamic configuration #2796
- Dynamic instrumentation #2796
- Can be enabled with datadog.dynamic_instrumentation.enabled=1.
- Exception replay #2796
- Can be enabled with datadog.exception_replay_enabled=1.
- Track peak memory usage in root span metrics #2840

### Changed
- Enable sidecar trace sender on PHP 8.3 #2729
- Optimize sending traces via sidecar Datadog/libdatadog#598
- Add new ini config datadog.crashtracking_enabled #2850
- Add ionCube to the list of incompatible extensions + add INI setting to ignore incompatible extensions #2858
- Enable CLI by default #2871

### Fixed
- Crashtracker: fix a use-after-free error #2843
- Fix curl integration race condition #2847
- Fix memory leak with sidecar trace sender #2875
- OpenTelemetry: Missing addLink method and Fiber handling #2849
- Mongodb: Deprecated exception in v1.20+ #2870
- Fix leaking sidecar sessions Datadog/libdatadog#642
- Implement deadlock watchdog for sidecar Datadog/libdatadog#647

### Internal
- Fix testsuite flakiness #2841, #2846, #2848, #2867
- Fix telemetry metric name Datadog/libdatadog#666

### SSI Loader changes
- Add SSI requirements.json file #2813
- Disable the tracer in case of a potential incompatibility (extension/jit) #2853

## Profiling

### Internal
- bump to Rust 1.76 #2876

## Application Security Management

### Changed
- Move helper to sidecar remote config #2864

### Fixed
- Fix improper symbol exports in appsec ext/helper #2854
- Remove gid from socket/lock path of helper #2855
- appsec ext: retry on connection refused #2860
- Fix orderly helper appsec shutdown #2859

### Internal changes
- Add appsec benchmarks #2791