feat(new transform): add a simple delay transform

[esensar]

Summary

Adds a new transform which delays each event in the pipeline by a fixed duration.

Vector configuration

sources:
  demo_logs_test:
    type: "demo_logs"
    format: "json"

transforms:
  delay_transform:
    inputs: ["demo_logs_test"]
    type: "delay"
    delay_per_event: 5

sinks:
  console:
    inputs: ["delay_transform"]
    target: "stdout"
    type: "console"
    acknowledgements:
      enabled: false
    encoding:
      codec: "json"

How did you test this PR?

Ran the included test and ran Vector with the above configuration to confirm that events were correctly delayed.

Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Closes: Feature request: sleep() function for inserting delay into processing chain #22146

Notes

• Please read our Vector contributor resources.
• Do not hesitate to use @vectordotdev/vector to reach out to us regarding this PR.
• Some CI checks run only after we manually approve them.
  • We recommend adding a pre-push hook, please see this template.
  • Alternatively, we recommend running the following locally before pushing to the remote branch:
    • make fmt
    • make check-clippy (if there are failures it's possible some of them can be fixed with make clippy-fix)
    • make test
• After a review is requested, please avoid force pushes to help us review incrementally.
  • Feel free to push as many commits as you want. They will be squashed into one before merging.
  • For example, you can run git merge origin master and git push.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run make build-licenses to regenerate the license inventory and commit the changes (if any). More details on the dd-rust-license-tool.

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