Add ability to generate HTML guides

[jan-cerny]

This request is to add ability to generate HTML guides using oscap-report. It will replace the oscap xccdf generate guide feature of OpenSCAP.

Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
oscap-report can generate HTML guides from a SCAP source data stream which will be visually similar to HTML reports, but wouldn't contain rule results. it will also be able to consume tailoring files.

Describe alternatives you've considered
I haven't considered any alternatives - the alternative is status quo.

Additional context

• Allow us to modernize the HTML guides.
• Opens ability to add another features to guides easily, eg. control mapping.
• Allow us to break the dependency of ComplianceAsCode on OpenSCAP.
• It will also open opportunities to provide browseable guides in our integrations.