Support custom deleter for SrsUniquePtr. (#4309)

SrsUniquePtr does not support array or object created by malloc, because
we only use delete to dispose the resource. You can use a custom
function to free the memory allocated by malloc or other allocators.
```cpp
      char* p = (char*)malloc(1024);
      SrsUniquePtr<char> ptr(p, your_free_chars);
```

This is used to replace the SrsAutoFreeH. For example:
```cpp
      addrinfo* r = NULL;
      SrsAutoFreeH(addrinfo, r, freeaddrinfo);
      getaddrinfo("127.0.0.1", NULL, &hints, &r);
```

Now, this can be replaced by:
```cpp
      addrinfo* r = NULL;
      getaddrinfo("127.0.0.1", NULL, &hints, &r);
      SrsUniquePtr<addrinfo> r2(r, freeaddrinfo);
```

Please aware that there is a slight difference between SrsAutoFreeH and
SrsUniquePtr. SrsAutoFreeH will track the address of pointer, while
SrsUniquePtr will not.
```cpp
      addrinfo* r = NULL;
      SrsAutoFreeH(addrinfo, r, freeaddrinfo); // r will be freed even r is changed later.
      SrsUniquePtr<addrinfo> ptr(r, freeaddrinfo); // crash because r is an invalid pointer.
```

---------

Co-authored-by: Haibo Chen <495810242@qq.com>
Co-authored-by: john <hondaxiao@tencent.com>

.vscode/settings.json

@@ -1,5 +1,23 @@
 {
     "cmake.sourceDirectory": "${workspaceFolder}/trunk/ide/srs_clion",
     "cmake.buildDirectory": "${workspaceFolder}/trunk/ide/vscode-build",
-    "cmake.configureOnOpen": false
+    "cmake.configureOnOpen": false,
+    "files.associations": {
+        "vector": "cpp",
+        "__hash_table": "cpp",
+        "__split_buffer": "cpp",
+        "__tree": "cpp",
+        "array": "cpp",
+        "bitset": "cpp",
+        "deque": "cpp",
+        "initializer_list": "cpp",
+        "list": "cpp",
+        "map": "cpp",
+        "queue": "cpp",
+        "set": "cpp",
+        "stack": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "unordered_map": "cpp"
+    }
 }