support sha256 and md5 algos for local file persister

[tbezman]

Coinbase needs to use SHA256 . We temporarily have been using a custom persist server that devs run locally. Would be nice to have it in the compiler.

I also threw MD5 in here while I was at it.

I updated the docs to tell more of a story around local persisting. I removed the old local persist server example since those use cases should be covered by the local file persister

[alunyov]

Thanks @tbezman!

I like the rust part.

What do you think about keeping the example persist script/server? But still adding the new section Local Persisted Queries.

[tbezman]

@alunyov Okay, I've added back the local persist server example. Let me know if we need any other changes?

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[eMerzh]

Sorry for chiming in after the fact ...

But this is really great :)

Do you think it would be possible to do that without using the "persistor" thing ?
like changing the cacheId in the opreations, but still have access to the operation's text ?

think it"s related to #2747

thanks