[4.x] Provide searchables()->lazy and insertLazily methods to search indexes #9072
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Maybe not the right approach, but this PR works to reduce the memory usage of searchables()->all() by providing a searchables()->lazy() method returning a less memory heavy LazyCollection. It also updates Algolia and Comb to use this instead of searchables()->all().
It could be possible to take this a step further and have the provider return a lazy collection and then insert each document individually rather than multiple, but that would mean more http calls so maybe thats a trade off.
Should help with #8854