feat(logging): add Kafka and Webhook audit targets

- Implemented `KafkaAuditTarget` to send audit entries to a Kafka topic.
- Implemented `WebhookAuditTarget` to send audit entries to a specified webhook URL.
- Updated `AuditLogger` to support multiple audit targets including Kafka and Webhook.
- Added examples and documentation for the new audit targets.

Cargo.lock

@@ -5192,6 +5192,36 @@ version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "20675572f6f24e9e76ef639bc5552774ed45f1c30e2951e1e99c59888861c539"
 
+[[package]]
+name = "rdkafka"
+version = "0.37.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14b52c81ac3cac39c9639b95c20452076e74b8d9a71bc6fc4d83407af2ea6fff"
+dependencies = [
+ "futures-channel",
+ "futures-util",
+ "libc",
+ "log",
+ "rdkafka-sys",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "slab",
+ "tokio",
+]
+
+[[package]]
+name = "rdkafka-sys"
+version = "4.8.0+2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ced38182dc436b3d9df0c77976f37a67134df26b050df1f0006688e46fc4c8be"
+dependencies = [
+ "libc",
+ "libz-sys",
+ "num_enum",
+ "pkg-config",
+]
+
 [[package]]
 name = "reader"
 version = "0.0.1"
@@ -5557,7 +5587,10 @@ dependencies = [
  "opentelemetry-semantic-conventions",
  "opentelemetry-stdout",
  "opentelemetry_sdk",
+ "rdkafka",
+ "reqwest",
  "serde",
+ "serde_json",
  "tokio",
  "tracing",
  "tracing-opentelemetry",