Sink | Add Parseable sink

[praveen5959]

Summary

Adds Parseable as a log destination - an S3-backed open-source observability platform for logs, metrics, and traces.

The new sink at vector-configs/sinks/parseable.toml is a thin wrapper over Vector's http sink, using HTTP basic auth and the X-P-Stream header to route events to a Parseable log stream. README updated with the provider table entry.

Configuration

Secret	Description
PARSEABLE_URL	Parseable ingest URL, e.g. https://parseable.example.com/api/v1/ingest
PARSEABLE_USERNAME	Parseable username (HTTP Basic auth)
PARSEABLE_PASSWORD	Parseable password (HTTP Basic auth)
PARSEABLE_STREAM	Target log stream name (default fly_logs); sent via X-P-Stream header

Testing

We tested on our Parseable instance and works as expected

[praveen5959]

Hey @draper7, would love to get your eyes on this when you get a chance.

[praveen5959]

Hey @draper7, would be great if we could get a review on this!!