feat(neovim-rust): Rust LSP, debugging, testing and keymaps

- `rustaceanvim` for LSP config
- Rust ft specific keymaps in `after/ftplugin`
- `nvim-dap` for Rust debugging with codelldb
- `rustaceanvim.neotest` for Rust testing
- `rcasia/neotest-bash` for Bash testing
- Better keymaps for running tests
- Inlay hint UI improvements

common/.config/nvim/lua/plugins/completion.lua

@@ -111,6 +111,7 @@ return {
 
             sources = {
                 default = {
+                    "lazydev",
                     "lsp",
                     "buffer",
                     "path",
@@ -143,6 +144,11 @@ return {
                             return vim.tbl_contains({ "gitcommit", "markdown" }, vim.o.filetype)
                         end,
                     },
+                    lazydev = {
+                        name = "LazyDev",
+                        module = "lazydev.integrations.blink",
+                        score_offset = 1001,
+                    },
                     lsp = {
                         score_offset = 1000,
                     },