Add Kernel API for publish binary message broadcast

[Zuoqiu-Yingyi]

REL: #9031

当前广播消息推送 API /api/broadcast/postMessage 不支持广播二进制消息，且每次仅能向一个信道广播一条消息，不能完全满足社区开发需求
Currently, the broadcast message push API /api/broadcast/postMessage does not support broadcasting binary messages, and can only broadcast one message at a time, which cannot fully meet the needs

新增内核 API /api/broadcast/publish，用户可以使用 FormData 在一次请求中向多个不同的信道广播多个字符串&二进制消息
The new kernel API /api/broadcast/publish allows users to broadcast multiple string & binary messages to multiple different channels in a single request using the FormData

使用示例 | Examples:

const formData = new FormData();
formData.append("channel-1", "string-message-1-1");
formData.append("channel-1", "string-message-1-2");

formData.append("channel-1", new Blob(["binary-message-1-1"]));
formData.append("channel-1", new Blob(["binary-message-1-2"]), "specified-filename-1-2");

formData.append("channel-2", "string-message-2-1");
formData.append("channel-2", "string-message-2-2");

formData.append("channel-2", new File(["binary-message-2-2"], "filename-2-1"));
formData.append("channel-2", new File(["binary-message-2-2"], "filename-2-2"), "specified-filename-2-2");

fetch("/api/broadcast/publish", {
    method: "POST",
    body: formData,
}).then(async response => {
    console.log(await response.json());
});

示例运行结果 | Example results:

{
    "code": 0,
    "msg": "",
    "data": {
        "results": [
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-1",
                    "count": 0
                },
                "message": {
                    "type": "string",
                    "size": 18,
                    "filename": ""
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-1",
                    "count": 0
                },
                "message": {
                    "type": "string",
                    "size": 18,
                    "filename": ""
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-2",
                    "count": 0
                },
                "message": {
                    "type": "string",
                    "size": 18,
                    "filename": ""
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-2",
                    "count": 0
                },
                "message": {
                    "type": "string",
                    "size": 18,
                    "filename": ""
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-1",
                    "count": 0
                },
                "message": {
                    "type": "binary",
                    "size": 18,
                    "filename": "blob"
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-1",
                    "count": 0
                },
                "message": {
                    "type": "binary",
                    "size": 18,
                    "filename": "specified-filename-1-2"
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-2",
                    "count": 0
                },
                "message": {
                    "type": "binary",
                    "size": 18,
                    "filename": "filename-2-1"
                }
            },
            {
                "code": 0,
                "msg": "",
                "channel": {
                    "name": "channel-2",
                    "count": 0
                },
                "message": {
                    "type": "binary",
                    "size": 18,
                    "filename": "specified-filename-2-2"
                }
            }
        ]
    }
}

已测试 | Tested

[88250]

感谢你的贡献，思源有你更精彩！
Thank you for your contribution. SiYuan will be more wonderful with you!