feat(commandline): add aiosandbox operator for remote sandbox execution

[Oanakiaja]

What type of PR is this?

feat: A new feature

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• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.
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feat(commandline): 添加 aiosandbox 远程沙箱执行器

(Optional) More detailed description for this PR

Add AIOSandbox as a new commandline.Operator implementation that provides remote sandboxed command execution via AIO Sandbox.

Features:

• Remote command execution in cloud-based sandbox environment
• Session persistence for stateful shell execution (KeepSession option)
• File operations: read, write, exists, isDirectory
• Compatible with StrReplaceEditor and PyExecutor tools
• Path traversal protection

zh:
新增 AIOSandbox 作为 commandline.Operator 接口的实现，支持通过 AIO Sandbox 服务进行远程沙箱命令执行。

特性：

• 云端沙箱环境中的远程命令执行
• 支持会话保持，实现有状态的 shell 执行（KeepSession 选项）
• 文件操作：读取、写入、存在检查、目录判断
• 兼容 StrReplaceEditor 和 PyExecutor 工具
• 路径遍历保护

(Optional) Which issue(s) this PR fixes:

(optional) The PR that updates user documentation:

[Oanakiaja]

Related PR: cloudwego/eino-examples#161: deep-aiosandbox example

[Oanakiaja]

Closing: will use the middleware pattern (filesystem.Backend) instead of the operator pattern for AIO Sandbox integration.