Add helix-lsp-types to workspace

Cargo.toml

@@ -5,6 +5,7 @@ members = [
   "helix-view",
   "helix-term",
   "helix-tui",
+  "helix-lsp-types",
   "helix-lsp",
   "helix-event",
   "helix-dap",

docs/architecture.md

@@ -3,6 +3,7 @@
 | -----------     | -----------                                                      |
 | helix-core      | Core editing primitives, functional.                             |
 | helix-lsp       | Language server client                                           |
+| helix-lsp-types | Language Server Protocol type definitions                        |
 | helix-dap       | Debug Adapter Protocol (DAP) client                              |
 | helix-loader    | Functions for building, fetching, and loading external resources |
 | helix-view      | UI abstractions for use in backends, imperative shell.           |