command解析出现了一些问题，没有避免原生属性访问

[NWYLZW]

Describe the bug
解析command时
会将一些原生属性访问到
例如toString,proto

To Reproduce
在有机器人的频道或私聊时发送
toString $args
proto
之类的

Expected behavior
期望不触发bug

Screenshots
一些日志

[W] session toString 123
    TypeError: argv.command.parse is not a function
        at _Session.resolve (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\session.ts:325:53)
        at _App._process (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:261:18)
        at processTicksAndRejections (internal/process/task_queues.js:93:5)
        at next (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:310:16)
        at next (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:310:16)
        at next (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:310:16)
        at _App._handleMessage (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:321:5)
        at async Promise.all (index 0)Middleware stack:
      - F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-plugin-common\src\admin.ts:274:23
      - F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-plugin-webui\src\server.ts:94:14
[W] session __proto__
    TypeError: Cannot read property 'set' of undefined
        at bind (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-plugin-common\src\admin.ts:261:34)
        at processTicksAndRejections (internal/process/task_queues.js:93:5)
        at Array.<anonymous> (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-plugin-common\src\admin.ts:290:9)
        at next (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:310:16)
        at next (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:310:16)
        at _App._handleMessage (F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-core\src\app.ts:321:5)
        at async Promise.all (index 0)Middleware stack:
      - F:\version-control\GIT\nodejs\tool-bot\node_modules\koishi-plugin-webui\src\server.ts:86:49

Versions
3.9.0

• OS: win10 20h2
• Node Version: 14.6.0
• CoolQ Version: none
• CQHTTP Version: 1.0.1-beta-3
• Koishi Version: 3.9.0

Additional context
null