Add Pathway docs to Third Party Tools

Pathway is an open-source, Rust-based framework for real-time data processing and streaming analytics. It enables developers to build low-latency pipelines for ingesting, transforming, and querying data at scale, with built-in support for incremental computation and connectors to databases like QuestDB.

Adding Pathway integration docs is essential because it bridges QuestDB's time-series strengths with Pathway's real-time processing capabilities, enabling seamless bidirectional streaming (e.g., via InfluxDB Line Protocol). This undocumented gap limits adoption in modern ETL/analyst workflows—official coverage would provide setup guides, examples, and troubleshooting, accelerating community contributions and positioning QuestDB as a top choice for dynamic data pipelines.

Pathway docs - https://pathway.com/developers/api-docs/pathway-io/questdb

@javier Assign this issue to me

Start with the repository's Third Party Tools documentation section and review the linked Pathway QuestDB API documentation. Add Pathway setup guidance, integration examples, and troubleshooting coverage; the work is done when the QuestDB integration is documented for real-time streaming workflows.