The helper types in mcp.server.types got really confusioning during
implementation as they overlapped with mcp.types. I now believe it
is better if we stay more low level to the spec types.
To do this, we now only use mcp.types everywhere. We renamed mcp.server.types
to mcp.server.models and removed it to the absolute minimum.
## Goal
Support running an MCP server in the same process as the client, while preserving MCP abstractions.
## Details
1. **(core change)** Adds a new `memory` transport module that enables in-process client-server communication.
This includes:
- `create_client_server_memory_streams()` to create bidirectional memory streams
- `create_connected_server_and_client_session()` to establish an in-process client-server connection
3. (minor) Enhances error handling and timeout support:
- Adds configurable read timeouts to sessions via `read_timeout_seconds` parameter
- Improves exception handling in the server with a new `raise_exceptions` flag to control whether errors are returned to clients or raised directly
- Ensures proper cleanup of request context tokens in error cases
4. (minor) Makes server improvements:
- Adds built-in ping handler support
