Add Windows support or allow to pass in an initialized sqlite instance

[escamoteur]

Hi,

currently flutter_cache_manager doesn't work on Windows Desktop. therefore also cached_network_image doesn't work which I really need.

Implementing a Windows version would be one but probably the more difficult option. As it's possible to use sqlite on Windows following https://moor.simonbinder.eu/docs/other-engines/vm/

Would it be possible to add a static function tha allows is to pass an existing sqlite instance? This way we could use it not only on Windows, but also on Linux and probably mac.

[renefloor]

In PR #193 (which is close to finished) I made it easier to support different 'cache object providers' and the next thing I plan to do is write one that is not depending on sqlite. That will be the default on windows and linux

[escamoteur]

awesome!!!

[renefloor]

For windows I could enable 'in memory' caching, but that is pretty heavy on memory usage. I think it needs at least this PR to be finished: flutter/plugins#2818

[escamoteur]

It works with the current version in the repo

path_provider: 1.5.1
path_provider_fde:
git:
url: https://github.com/google/flutter-desktop-embedding.git
path: plugins/flutter_plugins/path_provider_fde