feat: add k8s job task context resource context

[jtuglu1]

Description

Not in a reviewable state yet.

Support dynamically specifying K8s pod resources in the task context. This is helpful for cases when you have a heterogenous workload mix and want to allow submitting clients flexibility in tuning their tasks (and their respective subtasks). This doesn't directly change any JVM-related parameters (which should also be supplied in the task context).

Example:

"context": {
  "k8sTaskResources": {
    "cpu": "1",
    "memory": "4Gi",
    "byTaskType": {
      "partial_index_generate": {
        "cpu": "2",
        "memory": "8Gi",
        "ephemeral-storage": "200Gi"
      },
      "partial_index_generic_merge": {
        "requests": {
          "cpu": "500m",
          "memory": "2Gi"
        },
        "limits": {
          "cpu": "1",
          "memory": "4Gi"
        }
      }
    }
  }
}

Release note

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Key changed/added classes in this PR

• MyFoo
• OurBar
• TheirBaz

---

This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• a release note entry in the PR description.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
• added integration tests.
• been tested in a test Druid cluster.