Breaking change for statusline_separator field users | optimize statusline & make it overridable

added cmd fields for various plugins for example lspinstaller+lspconfig gets loaded only when a file opened but their commands can be run before a file is opened so I additionally lazy loaded them on their cmds too

lua/core/default_config.lua

@@ -22,21 +22,22 @@ M.ui = {
    theme_toggle = { "onedark", "one_light" },
    theme = "onedark", -- default theme
    transparency = false,
+
+   statusline = {
+      separator_style = "default", -- default/round/block/arrow
+      config = "%!v:lua.require'ui.statusline'.run()",
+      override = {},
+   },
 }
 
 M.plugins = {
    override = {},
    remove = {},
    user = {},
-
    options = {
       lspconfig = {
          setup_lspconf = "", -- path of lspconfig file
       },
-      statusline = {
-         separator_style = "default", -- default/round/block/arrow
-         config = "%!v:lua.require'ui.statusline'.run()",
-      },
    },
 }