feat: add common location API contracts

[Aniruddha-Shriwant]

Description

• Adds OpenAPI contracts for POST /common/location/autocomplete, /directions, /distance, and /geocode.
• Adds shared location request, response, and error schemas based on the platform-api implementation and existing fixtures.
• Regenerates reference/common.yaml with Redocly CLI 2.19.0.
• Does not add x-internal; these contracts remain public.

Validation

• Redocly 2.19.0 bundle completed successfully.
• Redocly lint reports no findings for the four new operations. The Common root still has five pre-existing security-defined errors and one pre-existing info-license warning.
• git diff --check passed.

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