feat: add nvim-mini/mini.completion

lua/plugins/mini_completion.lua

@@ -0,0 +1,15 @@
+MiniDeps.later(function()
+    require("mini.completion").setup({
+        lsp_completion = {
+            -- `source_func` should be one of 'completefunc' or 'omnifunc'.
+            source_func = "omnifunc",
+        },
+    })
+
+    vim.api.nvim_create_autocmd("LspAttach", {
+        callback = function(args)
+            vim.bo[args.buf].omnifunc = "v:lua.MiniCompletion.completefunc_lsp"
+        end,
+    })
+    vim.lsp.config("*", { capabilities = MiniCompletion.get_lsp_capabilities() })
+end)