When cloning a remote repo, config should be read from its pyproject.toml

[tarkatronic]

We will soon be able to read default configuration from a local pyproject.toml file, but this leaves a bit of a gap:

When you invoke tartufo with a git_url, it will clone that url into a local folder, and then scan that folder. But if that repo contains a pyproject.toml with a [tool.tartufo] section, we don't respect any of those options.

I don't think it makes sense, in this scenario, to read all options. But I think it does make sense to scan select options. The options I think we should attempt to read are:

• rules -- files containing regexes
• include-files -- Files to be included in the scan
• exclude-files -- Files to be excluded from the scan