Modernize pook

[sarayourfriend]

Modernize pook as a package in the following ways:

• Drop support for EOL'd Python versions (in other words, 3.7)
• Use pyproject.toml
• Use ruff to lint files
• Use pre-commit to add pre-commit hooks
• Use hatch to manage test and development environments
• Fix the test configuration to actually run the example tests
• Fix the documentation build
• Fix support for asynchronous functions in the activate decorator (this was a direct result of re-enabling the example tests and finding lots of little issues)
• Remove all mention of the unsupported pycurl library
• Clean up tests that can use pytest parametrize to do so (and get better debugging information during tests runs as a result)
• Use pytest-pook to clean up a bunch of unnecessary test fixtures
• Fix deprecation warning for invalid string escape sequences caused by untagged regex strings
• Clean up development dependencies