McuSupport: Version detection handling for kit requirements

Create appropriate instance of version detector depending on
parsed data from JSON and pass it to McuPackage's ctor. Also tests.

Change-Id: I4f7e5cd6d998745dfe951284c34904526abc216b
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mcusupport/mcupackage.cpp

@@ -108,6 +108,11 @@ QStringList McuPackage::versions() const
     return m_versions;
 }
 
+const McuPackageVersionDetector *McuPackage::getVersionDetector() const
+{
+    return m_versionDetector.get();
+}
+
 FilePath McuPackage::basePath() const
 {
     return m_fileChooser != nullptr ? m_fileChooser->filePath() : m_path;