Add support for excluding based on sourceset parent directories

[gdude2002]

While attempting to move Kord Extensions from the old cadixdev licenser plugin, I found that the Yumi plugin is checking the licences for generated source code.

Having chatted on Discord with Aurora, we realised that my situation was a little unexpected:

• KordEx generates quite a lot of source code using KSP, the Kotlin Symbol Processor.
• The IDE needs to be aware of this generated source, so we make it available via the idea plugin. This is an approach recommended by the official Kotlin documentation.
• Adding an exclusion on, for example, **/build/generated/** doesn't actually exclude the generated files.

I propose adding the ability to match the full, absolute path to each file instead of limiting matching to files and directories within the sourceset. It may be preferable to provide a toggle for this behaviour, if the maintainers feel that users wouldn't expect it.

Alternatively, perhaps a built-in (and potentially toggle-able) exclusion on build/generated might be a better approach.