Draft add cache to resolve

[fteychene]

Add cache to resolve as defined in standard

Create a Cache that check env vars depending on os and create folder if needed. On resolve_one_import it search in the cache folder if the import hash is available if cache and hash are available. If it exist then resolve and noramlize it. Check that the hash from the cache match the requested cache, if not delete the file from the cache If cache is missing or invalid load te import like before and try to save it if a hash for import is provided.

Todo :

• [x] Error management
• [x] Tests
• [x] Cache concurrency write (delegated to file API)
• [x] Validate SHA of loaded from cache (if not delete cache file and load normally)
• [x] ~Print info as defined in standard~ Didn't find how to send warn during compilation and feel out of scope for this PR
• [x] Unit test on cache

Rel: #135

[Nadrieril]

Great to see you're working on this! Let me know when you'd like me to have a look at it

[fteychene]

Hey @Nadrieril :wave: I think this code could be review

Still working on adding some unit tests on cache.rs but the logic code is reviewable I think

[Nadrieril]

Oh wow this is really good work! Your testing is quite thorough too. I'm happy to merge it as it is, unless you were planning to add some more tests

[fteychene]

It's ok for me, I think it could be merge as it :ok_hand: :rocket:

Thx

[Nadrieril]

Thanks again!