[auth] add an OIDC auth reader

[isaacdd]

Implements a reader that retrieves a signed token from an OIDC provider to be used in requests. This is useful, for example, if a monitored resource (e.g. HTTP check) requires a token auth that is dynamically generated by an OIDC provider

What does this PR do?

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

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