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Feature Request

On poetry 1.2.0b.

Profiled the lock routine, and it spends almost all of its time,( in this lock, 217 out of 260 total seconds) in this method:

which is understandable because it needs to install the package. But in my case it ends up installing the same versions of the package multiple times (eg. I have different dependencies for pandas depending on python version, and then for each version of pandas it has to solve the same dependencies for numpy depending on arch), and then across multiple locks the problem really compounds.

Shouldn't the result be the same every time you install the package? Why not cache this (and maybe offer a "clear/don't use installed metadata cache" if that causes problems for people")? I just did an extremely brutal hack of just pickling it within that function and loading it at the beginning if it was present and it seemed to work...