feat: Add parameter to display featured image caption - #65022

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Unlinked contributors: kaffeeringe, greening, jethin, janvitos, kevinpoot, belisama, supernovia, dhanson-wp, noellesteegs, jordonrupp-dev.

Co-authored-by: efu98 <elfu98@git.wordpress.org>
Co-authored-by: hagege <hage@git.wordpress.org>
Co-authored-by: carolinan <poena@git.wordpress.org>
Co-authored-by: nickbohle <nickbohle@git.wordpress.org>
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👋 Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @efu98! In case you missed it, we'd love to have you join us in our Slack community.

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