Add config options to add authentication attributes as mdc.

docs/features/http_mdc_authentication.md

@@ -0,0 +1,29 @@
+# Add authentication information to MDC
+
+This only applies to HTTP requests with successful security authentication.
+
+## Properties
+
+Property | Description | Default
+-------- | ----------- | -------
+`logger.http.authentication.enabled` | filter enabled? | `true`
+`logger.http.authentication.path` | filter path | `/**`
+`logger.http.authentication.order` | order for [Ordered](https://github.com/micronaut-projects/micronaut-core/blob/v3.2.0/core/src/main/java/io/micronaut/core/order/Ordered.java) | [ServerFilterPhase.SECURITY.after()](https://github.com/micronaut-projects/micronaut-core/blob/v3.2.0/http/src/main/java/io/micronaut/http/filter/ServerFilterPhase.java#L54)
+`logger.http.authentication.prefix` | prefix to MDC key | ``
+`logger.http.authentication.name` | MDC key of authentication name | `principal`
+`logger.http.authentication.attributes` | authentication attributes to add to MDC, | `[]`
+
+## Examples
+
+Configuration for adding some jwt claims:
+
+```yaml
+logger:
+  http:
+    authentication:
+      prefix: jwt.
+      name: sub
+      attributes:
+        - aud
+        - azp
+```