feat(nvim): v0.11: Use native LSP, Completion, Diagnostics

- Move all language LSP configurations to `nvim/lsp`
- Move nvim LSP configurations to `nvim/lua/core`
- Remove LSP attach keymaps where default ones exists and are usable
- Reorged LSP attach keymaps per plugin
- Move Lazy.nvim configurations to `nvim/lua/core`
- `nvim/init.lua` cleaned to only load other files
- Uniform diagnostics symbols across lualine & gutter

common/.config/nvim/lua/core/lazy.lua

@@ -0,0 +1,37 @@
+--    `:help lazy.nvim.txt` for more info
+local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
+if not (vim.uv or vim.loop).fs_stat(lazypath) then
+    local lazyrepo = "https://github.com/folke/lazy.nvim.git"
+    local out = vim.fn.system({
+        "git",
+        "clone",
+        "--filter=blob:none",
+        "--branch=stable",
+        lazyrepo,
+        lazypath,
+    })
+    if vim.v.shell_error ~= 0 then
+        vim.api.nvim_echo({
+            { "Failed to clone lazy.nvim:\n", "ErrorMsg" },
+            { out, "WarningMsg" },
+            { "\nPress any key to exit..." },
+        }, true, {})
+        vim.fn.getchar()
+        os.exit(1)
+    end
+end
+
+---@diagnostic disable-next-line: undefined-field
+vim.opt.rtp:prepend(lazypath)
+
+--  You can also configure plugins after the setup call,
+--    as they will be available in your neovim runtime.
+require("lazy").setup({
+    change_detection = {
+        notify = false,
+    },
+    build = {
+        warn_on_override = true,
+    },
+    spec = { { import = "plugins" } },
+})