feat(new sink): Keep sink

[sainad2222]

Change Type

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

Is this a breaking change?

• Yes
• No

How did you test this PR?

Vector config:

sources:
  prometheus:
    type: http
    address: 0.0.0.0:8686

sinks:
  keep:
    type: "keep"
    inputs: ["prometheus"]
    endpoint: "http://localhost:8080/alerts/event/vectordev?provider_id=test"
    api_key: "keepappkey"

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.

Checklist

• Please read our Vector contributor resources.
• If this PR introduces changes Vector dependencies (modifies Cargo.lock), please
  run dd-rust-license-tool write to regenerate the license inventory and commit the changes (if any). More details here.

References

• Closes: Add Keep sink #21965

[bits-bot]

All committers have signed the CLA.

[talboren]

@sainad2222 looks good!!

[pront]

Thanks @sainad2222, can you add a changelong fragment?

[pront]

Also, please take a look at this PR as an example on how to include this new sink to our website: https://github.com/vectordotdev/vector/pull/13007/files#diff-a0be14524a6e437c68388b393dbff417eceb1dd09857df9173b3e6f217f57376

You can start with the following:

• Run make generate-component-docs
• Add a website/content/en/docs/reference/configuration/sinks/keep.md

[sainad2222]

Not sure why this got modified. Let me know if it's not needed, I'll undo these manually