Add docker_logs datastream for docker container logs collection

[ChrsMark]

What does this PR do?

Add docker_logs data_stream in docker package so as to support containers' logs collection using the docker dynamic provider.

Related issues

• Relates Container logs integration #3163

Screenshots

How to test this PR locally

0. Make sure that you have access to /var/run/docker.sock and /var/lib/docker/containers. If needed change the permissions for example with sudo chmod -R 777 /var/run/docker.sock && sudo chmod -R 777 /var/lib/docker/containers.
1. Edit the docker-compose file that is used by elastic-package to bring the local stack up:
   In Elastic Agent section add the socket and the log dirs as volume mounts:

volumes:
    - "../certs/ca-cert.pem:/etc/ssl/certs/elastic-package.pem"
    - "/var/run/docker.sock:/var/run/docker.sock:ro"
    - "/var/lib/docker/containers:/var/lib/docker/containers:ro"

2. Bring stack up with elastic-package stack up -d -v --version=8.5.0
3. Add the docker package from fleet UI and make sure that logs from containers are being collected.

[elasticmachine]

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• Start Time: 2022-11-28T10:01:55.287+0000

• Duration: 2 min 6 sec

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Name	Metrics % (covered/total)	Diff
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[ChrsMark]

Changed the default path to /var/lib/docker/containers/${docker.container.id}/*-json.log from /var/lib/docker/containers/${docker.container.id}/${docker.container.id}-json.log to catch also possible rotated files.

[elasticmachine]

Package docker - 2.3.0 containing this change is available at https://epr.elastic.co/search?package=docker