Add anchor support for dynamic blocks

[shimotmk]

What?

Closes #51402

In previous versions, attributes were not saved in commented out format, so we changed it to save them in commented out format.

The PHP code was based on this PR #44771 .

<!-- wp:paragraph -->
<p id="paragraph-anchor">Welcome to WordPress. This is your first post. Edit or delete it, then start writing!</p>
<!-- /wp:paragraph -->

<!-- wp:archives {"anchor":"archives-anchor"} /-->

You can set anchors in both static and dynamic blocks without errors.
First, we implemented only the Archives block.

Testing Instructions

1. Open a post or page.
2. Insert a Archives block.
3. You can set the anchor
4. You can see that even if there is code that was not previously saved in commented out format, such as a paragraph block, no errors will occur.

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

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Co-authored-by: shimotmk <[email protected]>
Co-authored-by: Mamaduka <[email protected]>
Co-authored-by: stefanfisk <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[Mamaduka]

@shimotmk, have a look at #69002. @t-hamano suggested using a similar method for anchor support.

[shimotmk]

Oh.That's a good approach.
That might be a smarter approach.

[t-hamano]

@shimotmk Thank you for addressing this issue. I continue working on this in #70993.