Derive package folder from purl #98
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This PR adds code that derives the package folder from a given purl. Scanning will then take place in the package folder only.
The package folder is detected by traversing the repo's directory tree and inspecting all build files. The name of the build file and the method of parsing its content depends on the build environment used for the package. Build file inspection is currently implemented for
pom.xmlfiles (forpkg:mavenpurls) andpyproject.tomlfiles (forpkg:pypipurls). The package folder is the directory hat contains the build file which builds the package with the same name as the purl's name part. If found the package folder overrides the subfolder that can be specified in the UI.As a result of this PR the key for uniquely identifying a CBOM has changed. It is either the combination of [giturl, commit, subfolder] or [purl, commit].
Still to be implemented: inspection of gradle build files for maven purls. and setup.cfg (.py) files for pypi purls.