Increase coverage

[svlandeg]

Continue work from #1525, #1601 and #1680, vendoring Click.

This PR does a few things at once:

• Removing stuff we don't need in Typer
• Writing unit tests for things we do need/document but aren't thoroughly tested in Typer's test suite
• Adjusting the vendored code to adhere to Typer's code style
• Adding colorama as dependency for Windows. It's in fact already pulled in by pytest anyway, but I figured explicit is better.

It's big to review, but all edits should be relatively trivial. The diff can be reviewed as one (instead of per-commit), as almost all edits should be pretty local and no code has been moved around.

Removed stuff

Sebastián: if there's anything in the list below that we do want to keep as functionality, let me know, then I'll write additional unit tests instead of removing the relevant code.

• Remove unused code paths with UNSET (originally introduced in this PR). Typer has its own Default(...) to cover these use-cases.
• Remove unused functionality: FLAG_NEEDS_VALUE, __debug__ statements, batch(), protected_args, Parameter.deprecated
• Make _click.Command, _click.Parameter and _click.ShellComplete abstract
• Adapt original Click code to use Typer's code style: remove Sphinx-specific docs styling, remove from __future__ import annotations, import directly from typing and collections, remove usage of gettext, use f-strings

This was all done 100% manually.

Added tests

Added coverage for:

• _click.types.py & typer._types.py:
  • repr functions mostly added to existing type tutorial tests
  • convert functions into cf tests/test_type_conversion.py
  • shell_completion functionality into test_completion dir
  • other bits into ‎tests/test_types.py, ‎tests/test_types_files.py

This was done with AI assistance, micromanaged & thoroughly reviewed by me.

Coverage stats

This branch, before this PR:

13538 statements, 1037 missing (92.3% coverage)

This branch, after "cleaning" the original Click files:

13195 statements, 860 missing (93.5% coverage)

[github-actions]

📝 Docs preview

Last commit 4c894e5 at: https://6671d306.typertiangolo.pages.dev