fix(neovim): Rust test-coverage plugin & coding qol improvements

- Rust: `nvim-coverage` for generating code-coverage report
- Rust: Keymaps & nvim-job for test-coverage report display
- Coding-QOL: Remove distracting & noisy diagnostic virtual-line
- Coding-QOL: Keymaps to disable diagnostic virtual text
- Coding-QOL: Disable diagnostic underlines
- Fix: Disable telescope `hightlight` to fix frequent crash
- Coding-QOL: Telescope Keymaps to move between loops
- Coding-QOL: Disable auto fn doc hover through `blink`; `LSPSaga` does
  it better
- Coding-QOL: Adding back `quick-scope` with proper config
- Keymap: Use `ctrl-p` to search files; same as vscode

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

@@ -55,10 +55,6 @@ return {
                     border = "rounded",
                     draw = { treesitter = { "lsp" } },
                 },
-                documentation = {
-                    auto_show = true,
-                    auto_show_delay_ms = 100,
-                },
                 ghost_text = { enabled = false },
                 trigger = { show_on_trigger_character = true },
             },