feat(插件开发）：新增关键字匹配插件

plugins/keyword/README.md

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+# 目的
+关键字匹配并回复
+
+# 试用场景
+目前是在微信公众号下面使用过。
+
+# 使用步骤
+1. 复制 `config.json.template` 为 `config.json`
+2. 在关键字 `keyword` 新增需要关键字匹配的内容
+3. 重启程序做验证
+
+# 验证结果
+![结果](test-keyword.png)

plugins/keyword/__init__.py

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+from .keyword import *

plugins/keyword/config.json.template

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+{
+  "keyword": {
+      "关键字匹配": "测试成功"
+  }
+}

plugins/keyword/keyword.py

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+# encoding:utf-8
+
+import json
+import os
+import plugins
+from bridge.context import ContextType
+from bridge.reply import Reply, ReplyType
+from common.log import logger
+from plugins import *
+
+@plugins.register(
+    name="Keyword",
+    desire_priority=900,
+    hidden=True,
+    desc="关键词匹配过滤",
+    version="0.1",
+    author="fengyege.top",
+)
+class Keyword(Plugin):
+    def __init__(self):
+        super().__init__()
+        try:
+            curdir = os.path.dirname(__file__)
+            config_path = os.path.join(curdir, "config.json")
+            conf = None
+            if not os.path.exists(config_path):
+                logger.debug(f"[keyword]不存在配置文件{config_path}")
+                conf = {"keyword": {}}
+                with open(config_path, "w", encoding="utf-8") as f:
+                    json.dump(conf, f, indent=4)
+            else:
+                logger.debug(f"[keyword]加载配置文件{config_path}")
+                with open(config_path, "r", encoding="utf-8") as f:
+                    conf = json.load(f)
+            # 加载关键词
+            self.keyword = conf["keyword"]
+
+            logger.info(self.keyword)
+            self.handlers[Event.ON_HANDLE_CONTEXT] = self.on_handle_context
+            logger.info("[keyword] inited")
+        except Exception as e:
+            logger.warn(
+                "[keyword] init failed, ignore or see https://github.com/zhayujie/chatgpt-on-wechat/tree/master/plugins/keyword ."
+            )
+            raise e
+
+    def on_handle_context(self, e_context: EventContext):
+        if e_context["context"].type != ContextType.TEXT:
+            return
+
+        content = e_context["context"].content.strip()
+        logger.info("[keyword] on_handle_context. content: %s" % content)
+        if content in self.keyword:
+            logger.debug(f"[keyword] 匹配到关键字【{content}】")
+            reply_text = self.keyword[content]
+
+            reply = Reply()
+            reply.type = ReplyType.TEXT
+            reply.content = reply_text
+            e_context['reply'] = reply
+            e_context.action = EventAction.BREAK_PASS  # 事件结束，并跳过处理context的默认逻辑
+
+    def get_help_text(self, **kwargs):
+        help_text = "关键词过滤"
+        return help_text
+
+