Switch from cloudpathlib to universal_pathlib

[remi-braun]

universal_pathlib is fsspec-based and manages more usecases (such as URLs) than cloudpathlib.
It would therefore be useful to switch from cloudpathlib to universal_pathlib when this library will be more stable (and comes with a proper documentation)

However this is a big change, so do it only for 2.0 verison.

In the meantime, prepare the code for the switch with:

• Creating an alias for AnyPath
• Don't import cloudpathlib outside of functions

[remi-braun]

Wait for :

• Prepare for release v0.3.0 fsspec/universal_pathlib#223
• Inherit from PathBase instead of Path fsspec/universal_pathlib#193
• Question on using UPath and fs copy/put fsspec/universal_pathlib#309

[remi-braun]

The code is OK, see #33 for more insights (merged into 2.0.0 branch)

[remi-braun]

We are waiting for version 0.3.0 of upathlib to solve the issues mentioned in a precedent comment before any 2.0.0 release.

[remi-braun]

TODO - Adapt the following modules:

• s3
• unistra