DOC-6508 JSON page and examples for Rust

[andy-stark-redis]

Rust doesn't support Redis search yet, but a JSON example is very useful to have, so this is example is a bit different to the JSON examples for the other clients. Also added Rust examples for the JSON data type pages and added the command to API mappings for the Rust JSON commands.

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Note

Low Risk
Low risk documentation/data updates that don’t affect runtime behavior; main risk is incorrect example output or API signature mismatches in the new command-to-client mappings.

Overview
Adds a new Rust client docs page, content/develop/clients/rust/json.md, documenting a simple end-to-end RedisJSON workflow (create, read nested paths, update fields, append to arrays) for both sync and async redis-rs.

Introduces new runnable Rust example sources for rust_home_json and for the json_tutorial used by the JSON data type pages (local_examples/rust-{sync,async}/dt-json.rs), covering common JSON string/number/array/object operations and JSONPath queries.

Extends multiple data/command-api-mapping/JSON.*.json files to include redis_rs_sync and redis_rs_async API signatures/params/returns for RedisJSON commands (e.g., JSON.GET, JSON.SET, array ops, object ops, numeric ops).

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[github-actions]

DOC-6508

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6508-rust-json/develop/clients/rust/json/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[dwdougherty]

LGTM.

[andy-stark-redis]

Thanks @dwdougherty !