Add supported-table directive that validates whether all different targets we support are documented

[Miauwkeru]

This adds a .. dissect-supported-table directive which verifies whether our tables in supported-targets.rst are still up to date

The directive itself provides the following options:

• source-path: where it needs to start looking for modules within the directory specified by the dissect_projects_path config value (required)
• blacklist: a comma seperated list that tells the plugin to ignore those modules
• glob-pattern: a pattern to search for inside source-path if not specified it uses *.py by default

closes #106

[Schamper]

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