stacklok / toolhive / 18312970313

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Update MCP parser to support latest specification (#1993)

* Update MCP parser to support latest specification

Add support for new MCP methods from the 2025-06-18 specification:
- elicitation/create for user input requests
- sampling/createMessage for message creation
- resources/subscribe and resources/unsubscribe for resource subscriptions
- resources/templates/list for template listing
- roots/list for listing roots
- notifications/progress for progress notifications
- notifications/cancelled for cancellation notifications
- Additional notification methods for list changes

Update completion/complete handler to properly handle both
PromptReference and ResourceTemplateReference types as specified
in the latest schema.

Add comprehensive test coverage for all new methods to ensure
proper extraction of resource IDs and arguments.

* test: add comprehensive test coverage for MCP parser

- Added tests for all new MCP methods from 2025-06-18 specification
- Added edge case tests for error handling and malformed inputs
- Added tests for JSON-RPC notifications (messages without ID)
- Improved test coverage from ~66% to 91.7% for pkg/mcp
- All parser functions now have 83-100% coverage

* Address PR feedback

Signed-off-by: Juan Antonio Osorio <ozz@stacklok.com>

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Signed-off-by: Juan Antonio Osorio <ozz@stacklok.com>

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