Enhance hook to clear data cache

[akshayraje]

We already have a hook to clear data cache here src/wordlift/api-data/class-api-data-hooks.php

The same needs to be enhanced such that:

• It is triggered on updated_post_meta action of any post meta (currently it only triggers on wl_schema_url meta key)
• Yet run the actual delete call delete_cache_for_meta_values only once, by batching requests and using the shutdown hook or something similar.