Add the "post format name" block binding

[carolinan]

Description
Adds a block binding that displays the post format name. If the standard post format is used, the name is not printed.

Adds a pattern to help user insert the post format name using a paragraph block.
For this pattern, I used the same pattern category that is used for the other two post format patterns: twentytwentyfive_post-format

Feel free to adjust any part of the PR including the naming and description.

Testing Instructions

To test, create one or more posts with post formats assigned.
Insert the pattern where you want to test it, in a template or content.

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Co-authored-by: carolinan <[email protected]>

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