Simplify locating of package signatures with repod-file

David Rungerequested to merge
simplify_package_import into main

repod/cli/argparse.py: Add flag (-s/ --with-signature) for signature collection to repod-file package inspect and repod-file package import.

repod/cli/cli.py: Change repod_file_package() to more easily collect package signatures by using args.with_signature.

tests/cli/test_cli.py: Adapt tests to changes in repod_file_package() behavior.

repod/files/package.py: Change Package.from_file() to fail if a signature file does not exist or does not match the package name.

tests/files/test_package.py: Adapt tests to changes in Package.from_file() behavior.

docs/repod/tooling.rst: Adapt documentation to the changes in the CLI options of repod-file package inspect and repod-file package import.

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