tower-lsp 0.12.0

Added

• Add private subcrate tower-lsp-macros for internal use only (PR #202).
• Implement cancellation support via $/cancelRequest (PR #202).
• Officially support serving over TCP (PR #198).

Changed

• Update lsp-types crate from 0.74 to 0.79.
• Have language servers store Client directly as struct field (PR #199).
• Replace jsonrpc-core with minimal JSON-RPC implementation (PR #202).
• Redefine LspService as Service<Incoming, Response = Option<Outgoing>>.
• Implement FusedStream for MessageStream.

Fixed

• Fix typo which caused workspace/didChangeConfiguration to break (PR #195).
• Implement proper parse error recovery in LSP codec (PR #201).
• Refuse to accept further requests after shutdown has been called once.

Removed

• Remove dependency on jsonrpc-core, as tower-lsp no longer relies on it.
• Remove LspService::with_handler() constructor (PR #202).