Replace usage of os.path and path.py with pathlib

[elfkuzco]

Fixes #195

Rationale

Use pathlib.Path for all path operations instead of a combination of os.path and path.py.

Changes

• Replace all usages of os.path and path.py to pathlib.Path
• Add type annotations for some parts of the code
• Use f-strings to build urls instead of os.path.join

[benoit74]

Thank you, this looks very good, only minor comments to discuss (not sure I'm right on all of them ^^)

[elfkuzco]

@benoit74 , I have made the necessary fixes but I'm unable to run the full check anymore as my VM instance on GCP keeps running out of space (over 20Gb). However, I can verify that the previous commands run to full completion

[benoit74]

I have made the necessary fixes but I'm unable to run the full check anymore as my VM instance on GCP keeps running out of space (over 20Gb). However, I can verify that the previous commands run to full completion

That's enough for me, we will make a full run before releasing this anyway.

[benoit74]

LGTM