feat: Add datadog and elastic-apm tracing schema

[sawadashota]

Related issue(s)

Add datadog and elastic-apm tracing schema. Oathkeeper uses [email protected] so that instana and otel have been not supported yet.
Related: #830 #832

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• 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
  [email protected]) 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 or changed the documentation.

Further Comments