feat(MCP): Add upsert-records tool to RedisVL MCP

[vishal-bala]

Builds on top of #539

Note

Medium Risk
Adds a new MCP write path that validates, embeds, and persists records to Redis, which can affect data integrity and partial-write behavior. Scope is contained to a new tool with tests and is gated behind read_only mode.

Overview
Adds a new MCP tool, upsert-records, to insert/update documents in the configured Redis index, including request validation, optional server-side embedding generation (with async/sync/batch fallbacks), and HASH vector serialization prior to index.load().

Updates MCP server tool registration to include upsert-records only when not in read_only mode, and exports the new tool from redisvl.mcp.tools. Adds unit + integration coverage for success cases, validation failures (pre-write), embedding behavior (skip_embedding_if_present), and marking backend failures as partial_write_possible.

Separately adjusts MCP filter typing annotations to use typing.Union/List/Dict instead of newer syntax.

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✅ No security findings were detected in this PR

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[chatgpt-codex-connector]

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