refactor to add lib and split out endpoints

[robmck1995]

Description

• Refactored the main application structure by moving server setup and endpoint definitions to a new library module.
• Implemented initialize_app_state and run_server functions to streamline server initialization.
• Added new handler modules for API endpoints, improving modularity.
• Updated Cargo.toml to configure the library.

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Changes walkthrough

	Relevant files
Enhancement	main.rs Refactor main to utilize library functions                                          lsproxy/src/main.rs Removed server setup and endpoint definitions. Simplified main function to use new library functions. Integrated initialize_app_state and run_server. +6/-440  lib.rs Create library module for server setup                                                  lsproxy/src/lib.rs Created a new library module for server setup. Defined initialize_app_state and run_server functions. Added OpenAPI documentation generation. +182/-0  mod.rs Add and export handler modules                                                                  lsproxy/src/handlers/mod.rs Added modules for endpoint handlers. Re-exported handler functions. +6/-0
Miscellaneous	api_types.rs Update imports in api_types module                                                          lsproxy/src/api_types.rs - Updated imports for `lsp_types`. +2/-2
Configuration changes	Cargo.toml Configure library in Cargo.toml                                                                lsproxy/Cargo.toml - Added library configuration. +5/-0

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Things to consider 🐛

• The function initialize_app_state in lsproxy/src/lib.rs (lines 68-76) initializes the LspManager but does not handle potential errors from start_langservers. If start_langservers fails, it could lead to unhandled exceptions or incorrect application state.

• In lsproxy/src/lib.rs, the check_mount_dir function (lines 28-30) is called in run_server (lines 80-83) to ensure the mount directory exists. However, if the directory is not mounted, the error message is printed, but the server initialization continues. This could lead to runtime errors if the directory is required for server operations.