feat(CodeBlock): support matplotlib in code execution

[alephpiece]

What this PR does

• 支持在代码块中使用 matplotlib 生成图像
• 调整 worker 初始化超时

Before this PR:

无法使用 matplotlib 输出图像

After this PR:

可以使用

Fixes #

Why we need it and why it was done in this way

The following tradeoffs were made:

The following alternatives were considered:

Links to places where the discussion took place:

Breaking changes

If this PR introduces breaking changes, please describe the changes and the impact on users.

Special notes for your reviewer

Checklist

This checklist is not enforcing, but it's a reminder of items that could be relevant to every PR.
Approvers are expected to review this list.

• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature.

Release note

[alephpiece]

用 ImageViewer 展示图片。
移除 ImagePreview，它已经完全被 ImageViewer 替代了。

[GeorgeDong32]

Looks Good，明天我再测一下资源释放啥的是不是正常的