Bug fixes and tweaks

This release:

• renames --source-dir to --module-dir, to clarify that it should be the directory holding the module's sources;
• shows the before and after coverage relative to the source files requested, if any;
• fixes authentication error handling;
• switches to also using pytest-cleanslate for disabling polluting tests;
• fixes GPTv1 and Claude prompts not using filenames relative to the Python path, causing some LLMs to generate import statements starting with "lib" or "src";
• fixes a bug not ignoring import __main__ while detecting unavailable imports;

GPT4o default, improved test isolation

This release:

• switches to using the faster (and much cheapter) GPT4o model by default;
• greatly improves test isolation support, which now resides in pytest-cleanslate;

Increased model support, test isolation, bug fixes

• added support for Anthropic, Bedrock and Ollama models, using litellm;
• added --prompt-family to select between prompt styles/versions;
• separated prompts into more easily modifiable module;
• implemented test collection isolation and changed to using it by default;
• various improvements to "bad test" finder;
• various adjustments to the prompts;
• implemented asynchronous test running and coverage collection;
• various bug fixes;
• improved packaging, so that project description shows properly on PyPI;

Bugfix release

Just a quick bugfix release.

Initial release

Bringing out a first, very early, release of CoverUp. Yay!