feat(MCP): Implement the base framework for a RedisVL MCP server

[vishal-bala]

This PR implements the base framework for a RedisVL MCP server. In this iteration, the goal is to introduce the scaffolding for the MCP server to the extent that the server is runnable but does not have any meaningful functionality.

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Note

Medium Risk
Introduces a new MCP server startup/shutdown path that opens Redis connections, inspects index metadata, and instantiates vectorizers; failures here could impact runtime behavior and resource cleanup. Risk is mitigated by extensive unit/integration coverage for config validation and lifecycle handling.

Overview
Adds an initial redisvl.mcp package that makes RedisVL runnable as an MCP server via the optional mcp extra (fastmcp + pydantic-settings).

The new framework loads/validates a YAML MCP config (with ${ENV} substitution), enforces a single index binding, inspects an existing Redis search index at startup, applies schema override patches when FT.INFO is incomplete, and initializes an AsyncSearchIndex plus a configured vectorizer with concurrency/timeout guards.

Also adds a stable MCP error contract (MCPErrorCode, RedisVLMCPError, map_exception), updates import-sanity tests to skip redisvl.mcp when extras aren’t installed, and adds unit + integration tests covering config validation, schema override safety, vector dim mismatch, and resource cleanup on failure/shutdown.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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[chatgpt-codex-connector]

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