feat: added new tracer ElasticAPM

[monwolf]

Related issue

I don't created the issue, but I have the necessity to be able to trace with this APM: ORY Hydra

Proposed changes

Added the capability to trace Hydra with Elastic APM

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation within the code base (if appropriate).

Further comments

To make it work, you should declare at least ELASTIC_APM_SERVER_URL and TRACING_PROVIDER=elastic-apm

  # - ELASTIC_APM_SERVER_URL="http://apm-server:8200"
  # - ELASTIC_APM_SERVICE_NAME="ORY Hydra"
  # - ELASTIC_APM_SERVICE_VERSION="1.9.0"
  # - ELASTIC_APM_ENVIRONMENT="devel"

The result should be:

[monwolf]

@aeneasr I've updated the version of ory/x and now it's compiling and passing the tests well in Hydra, I think this PR is ready to merge it

[aeneasr]

Sorry for the slow turnover - thank you!