Tool annotations for functions and external MCP servers

This release adds tool annotation support to the Speakeasy Functions framework and persists annotations from external MCP servers to the database.

Tool annotations in functions framework #1571 - Added ToolAnnotations type allowing function authors to specify annotations via Functions.tool({ annotations: { ... } }). (Author: @simplesagar)
Persist external MCP tool annotations #1596 - Annotations from external MCP servers in the Catalog are now persisted to the database. (Author: @simplesagar)