Refine structured logging

Refine structured logging to support `Environment`, `ApplicationPid` and
`ElasticCommonSchemaService` injection. With these updates we are able
to remove the `ApplicationMetadata` class and simplify the parameters
passed to the layout/encoder classes.

Closes gh-41491

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/features/logging.adoc

@@ -440,7 +440,7 @@ Handling authenticated request
 == Structured Logging
 
 Structured logging is a technique where the log output is written in a well-defined, often machine-readable format.
-Spring Boot supports structured logging and has support for the following formats out of the box:
+Spring Boot supports structured logging and has support for the following JSON formats out of the box:
 
 * xref:#features.logging.structured.ecs[Elastic Common Schema (ECS)]
 * xref:#features.logging.structured.logstash[Logstash]
@@ -474,6 +474,22 @@ A log line looks like this:
 This format also adds every key value pair contained in the MDC to the JSON object.
 You can also use the https://www.slf4j.org/manual.html#fluent[SLF4J fluent logging API] to add key value pairs to the logged JSON object with the https://www.slf4j.org/apidocs/org/slf4j/spi/LoggingEventBuilder.html#addKeyValue(java.lang.String,java.lang.Object)[addKeyValue] method.
 
+The `service` values can be customized using `logging.structured.ecs.service` properties:
+
+[configprops,yaml]
+----
+logging:
+  structured:
+    ecs:
+      service:
+        name: MyService
+        version: 1.0
+        environment: Production
+        node-name: Primary
+----
+
+NOTE: configprop:logging.structured.ecs.service.name[] will default to configprop:spring.application.name[] if not specified.
+
 
 
 [[features.logging.structured.logstash]]