common : add llama.vim preset for Qwen2.5Coder1.5B

This commit adds a preset for llama.vim to use the default Qwen 2.5
Coder 1.5B model.

The motivation for this change is to make it easier to start a server
suitable to be used with the llama.vim plugin. For example, the server
can be started with the following command:
```console
$ llama.vim --vim-qwen2.5-Coder-1.5B-default
```

Refs: ggml-org#10932

common/arg.cpp

@@ -2501,5 +2501,21 @@ common_params_context common_params_parser_init(common_params & params, llama_ex
         }
     ).set_examples({LLAMA_EXAMPLE_EMBEDDING, LLAMA_EXAMPLE_SERVER}));
 
+    add_opt(common_arg(
+        {"--vim-qwen2.5-Coder-1.5B-default"},
+        string_format("use default Qwen 2.5 Coder 1.5B (note: can download weights from the internet)"),
+        [](common_params & params) {
+            params.hf_repo = "ggml-org/Qwen2.5-Coder-1.5B-Q8_0-GGUF";
+            params.hf_file = "qwen2.5-coder-1.5b-q8_0.gguf";
+            params.port = 8012;
+            params.n_gpu_layers = 99;
+            params.flash_attn = true;
+            params.n_ubatch = 1024;
+            params.n_batch = 1024;
+            params.n_ctx = 0;
+            params.n_cache_reuse = 256;
+        }
+    ).set_examples({LLAMA_EXAMPLE_SERVER}));
+
     return ctx_arg;
 }