Support --all for `wp embed cache clear`

[stefanfisk]

Feature Request

• Yes, I reviewed the contribution guidelines.

Describe your use case and the problem you are facing

There's currently no way of completely clearing the oembed cache. This is for example useful after one has added a oembed_dataparse filter to modify the HTML.

Describe the solution you'd like

I'd propose adding an cache clear-all command.

The quick and dirty version is to run DELETE FROM wp_posts WHERE post_type = 'oembed_cache' and DELETE FROM wp_postmeta WHERE meta_key LIKE '_oembed_%'.

[danielbachhuber]

@stefanfisk The use-case seems reasonable to me!

The feature itself might be better implemented by changing wp embed cache clear <post_id> to wp embed cache clear [<post_id>...] [--all].

With this change, the command should error if neither post IDs nor --all are provided.

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