Add policy languages and runtimes doc

[sehan-dissanayake]

Purpose

Introduce a new gateway documentation page that explains policy authoring in Go and Python, the runtime architecture, policy anatomy (definition and implementation), build integration, and guidance for choosing a language. Also update docs/gateway/README.md to link to the new Policy Languages and Runtimes guide. This provides developers with guidance on Go (default) vs Python (beta) policies, execution model, and packaging/build workflows.

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Configuration used: Organization UI

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Run ID: abe002f1-1fe6-49ef-b809-f3fea7abc8dd

📥 Commits

Reviewing files that changed from the base of the PR and between 23f01a4 and c2d39ca.

📒 Files selected for processing (2)

• docs/gateway/README.md
• docs/gateway/policy-languages-and-runtimes.md

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[renuka-fernando]

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