Add pydantic models for borg 1.x's CLI (#8338)

[a-gn]

This adds pydantic models for borg's CLI outputs (fixes #8338).

Sadly I can't try to run these tests locally; when trying to run tox or pip install borg I get OSError: pkg-config probably not installed: FileNotFoundError(2, 'No such file or directory').

[a-gn]

Let me know if you think this new argument is bad. The function is harder to test when it always takes time.time().

[a-gn]

@ThomasWaldmann I just fixed the Python 3.10 union syntax, hopefully that's the last of it.

[ThomasWaldmann]

Looks like mypy is unhappy.

[a-gn]

Looks like mypy is unhappy.

mypy: commands[0]> mypy --ignore-missing-imports
src/borg/helpers/shellpattern.py:88: note: By default the bodies of untyped functions are not checked, consider using --check-untyped-defs  [annotation-unchecked]
src/borg/public/cli_api/v1.py:15: error: Module "typing" has no attribute "Self"  [attr-defined]
src/borg/public/cli_api/v1.py:15: note: Use `from typing_extensions import Self` instead
src/borg/public/cli_api/v1.py:15: note: See https://mypy.readthedocs.io/en/stable/runtime_troubles.html#using-new-additions-to-the-typing-module
src/borg/public/cli_api/v1.py:115: error: Invalid type alias: expression is not a valid type  [valid-type]
src/borg/public/cli_api/v1.py:115: error: Unsupported left operand type for | ("type[ArchiveProgressLogLine]")  [operator]

I might have left some Python 3.10-specific things in there, sorry! Will fix them when I have time. Also maybe there are some missing hints.