feat(sandbox): 支持 create 和 connect 指定运行用户

[eirture]

变更内容

• 为 sandbox create/connect 增加 --user/-u 参数
• 将指定用户透传到终端 PTY 创建选项
• 更新 create/connect 文档与命令文档测试

验证

• go test ./cmd_test ./iqshell/sandbox/sandbox/operations

[fennoai]

No issues found in this review.

Verified with go test ./cmd_test ./iqshell/sandbox/sandbox/operations, git diff --check, and gofmt -l on changed Go files.

[eirture]

/cc @miclle

[fennoai]

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[qiniu-prow]

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This pull-request has been approved by: eirture, miclle

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