refactor(lsp): Improve LSP Server and Component Architecture (#18)

This introduces a series of refactorings to improve the
structure, testability, and robustness of the LSP server and its related
components.

Key changes include:
- Centralized command execution and error handling within the LSP
server.
- Implemented the command pattern for LSP actions, organizing them into
distinct modules.
- Extracted the `LspServer` into its own module for better separation of
concerns.
- Improved the component factory and LSP server lifecycle management.
- Introduced `mockall` to enhance testing capabilities.
- Used a trait for `ComponentFactory` to allow for easier mocking and
dependency injection.
- Addressed clippy warnings by deriving `Default` for test helper
structs.

Author: tembleking

Cargo.lock

@@ -34,8 +34,10 @@ tracing = "0.1.41"
 tracing-subscriber = "0.3.19"
 
 [dev-dependencies]
-itertools = "0.14.0"
-lazy_static = "1.5.0"
-rstest = "0.26.1"
-tracing-subscriber = { version = "0.3.19", features = ["fmt", "env-filter"] }
+rstest = "0.21.0"
+serial_test = "3.1.1"
 tracing-test = "0.2.5"
+mockall = "0.13.0"
+
+[features]
+default = []