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/config/util.lua

@@ -12,7 +12,7 @@ local M = {
             BreakpointRejected = { " ", "DiagnosticError" },
             LogPoint = ".>",
         },
-        diagnostics = { Error = " ", Warn = " ", Hint = " ", Info = " " },
+        diagnostics = { ERROR = " ", WARN = " ", HINT = " ", INFO = " " },
         git = { added = " ", modified = " ", removed = " " },
         kinds = {
             Array = " ",