[Backport release/1.9.x] Add access log configuration for geoserver

[groldan]

Backport #575
Authored by: @groldan

Introduce an AccessLogFilter to log incoming requests based on the following configuration in geoserver_logging.yml, allowing to enable/disable the access log, and define which URIs to log when the logging.level.org.geoserver.cloud.accesslog logging topic is set to different levels:

logging:
  # Control behavior of the org.geoserver.cloud.accesslog logging topic. When enabled, the request logs will include the URI's that match
  # the following regular expressions at the spefified level. The defafult level is info (see logging.level.org.geoserver.cloud.accesslog below)
  # Additionally, if the json-logs spring profile is enabled, the log entries will include MDC attributes configured in the logging.mdc.include.* properties bellow
  accesslog:
    enabled: true
    # A list of java regular expressions applied to the request URL for logging at info level
    # The default behavior is to log all requests to the REST API
    info:
    - .*\/(rest|gwc\/rest)(\/.*|\?.*)?$
    # A list of java regular expressions applied to the request URL for logging at debug level
    # The default behavior is to log OWS requests
    debug:
    - .*\/(ows|ogc|wms|wfs|wcs|wps)(\/.*|\?.*)?$
    # A list of java regular expressions applied to the request URL for logging at trace level
    # The default behavior is to EXCLUDE only webui's static resources and known image extensions
    trace:
    - ^(?!.*\/web\/wicket\/resource\/)(?!.*\.(png|jpg|jpeg|gif|svg|webp|ico)(\\?.*)?$).*$

For example, the following request:

curl -u admin:geoserver -X POST -H "Content-Type: application/xml" \
http://localhost:9090/geoserver/cloud/rest/workspaces \
-d '<workspace><name>testws</name></workspace>'

Will produce a log entry like this (except the JSON formatting, which is added for clarity):

{
  "@timestamp": "2024-12-16T04:51:11.229-03:00",
  "@version": "1",
  "message": "POST 201 /geoserver/cloud/rest/workspaces ",
  "logger_name": "org.geoserver.cloud.accesslog",
  "thread_name": "http-nio-9105-exec-2",
  "level": "INFO",
  "level_value": 20000,
  "enduser.authenticated": "true",
  "application.instance.id": "restconfig-v1:192.168.86.128:9105",
  "enduser.id": "admin",
  "http.request.method": "POST",
  "application.version": "1.10-SNAPSHOT",
  "http.request.id": "01jf9sjy4ndynkd2bq7g6qx6x7",
  "http.request.url": "/geoserver/cloud/rest/workspaces",
  "application.name": "restconfig-v1"
}