Improve password management

[sdispater]

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code.

This PR is a refactoring of the password management of Poetry. This alleviates some of the keyring shortcomings and delays the import of keyring to only
when it's needed to avoid the CLI hanging because of it (see #1779).

Fixes #1779
Fixes #1719
Fixes #1565
Fixes #1335

[K900]

Would be really nice to see the keyring dependency bumped to something like >=19.0 on Python 3. It makes source built Poetry not run on Arch...

[Ivoz]

Unfortunately keyring 19.0 drops python 2.7, so you'd have to figure out what you want to do about that

[danieleades]

hi there, i'm still seeing these issues on ubuntu 18.04.

the system library of keyrings.alt is being picked up, and it's trying to import keyring.util.escape, which doesn't exist in the vendored version of keyring (but does in the system version). Does this merge really fix the root cause of #1719 and #1335, or does it just postpone the import so that only some commands are broken?

If there's any other details i can provide, or a more appropriate place to report this, please let me know!

[christian-hawk]

Happens on github actions ubuntu/latest too.

[github-actions]

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