Implement post-meta-inline template part to display post meta fields in an inline block

[bobbingwide]

Requirements

• Display post meta information in an inline group below the post for the single-post template

Proposed solution

Use some custom CSS and an additional CSS class of flex to cause the blocks in a group flow inline using display: flex.

As documented in https://s.b/wp55/thisis/2021/05/07/how-do-i-make-inline-blocks/
to be cloned to https://sneak-peek.me/2021/05/07/how-do-i-make-inline-blocks/

See also WordPress/gutenberg#26899