weaviate [WIP] Introduce native MCP API

This PR adds basic MCP capabilities to Weaviate through a new endpoint for agentic use-cases

It introduces a dependency on mcp-go for scaffolding and bootstrapping an MCP API using the Streamable HTTP standard proposed in the spec
It exposes four tools for performing basic operations against Weaviate:
- get-schema to return the full list of collection configurations
- get-tenants to return the full list of tenants of a multi-tenancy collection
- search-with-hybrid to perform a vector search using Weaviate's hybrid algorithm
- insert-one to add a single object to a collection
A new RBAC domain gating MCP capabilities behind a dedicated permission in RBAC-enabled instances

[ ] Documentation has been updated, if necessary. Link to changed documentation:
[ ] Chaos pipeline run or not necessary. Link to pipeline:
[x] All new code is covered by tests where it is reasonable.
[ ] Performance tests have been run or not necessary.