Add packaging configurations for qtscxml

Packaging configurations for qtlottie#6.1.0

• Release description file
  • like https://codereview.qt-project.org/gitweb?p=qtsdk/tqtc-qtsdk.git;a=blob;f=packaging-tools/configurations/releases/release-addons-qt3d-601.ini;h=ec0989c7ed33407f09331dd25c421ea688e63e01;hb=HEAD
• Add a repository configurations
  • like https://codereview.qt-project.org/gitweb?p=qtsdk/tqtc-qtsdk.git;a=tree;f=packaging-tools/configurations/repository_configs/addons/qt3d;h=eeabe272cd4996f5f9eb5e30e2dac12195fcc8c0;hb=HEAD
• Add additional library packaging configuration files
  • Like qt3d in https://codereview.qt-project.org/gitweb?p=qtsdk/tqtc-qtsdk.git;a=tree;f=packaging-tools/configurations/all-os/addons;h=ef3882191aa04a82a90ce6acc829bd2ec1ea7334;hb=HEAD
  • Like qt3d in https://codereview.qt-project.org/gitweb?p=qtsdk/tqtc-qtsdk.git;a=tree;f=packaging-tools/configurations/pkg_templates/pkg_qt6_addons;h=d68a9950dff227d3ed458d743de1131ca4f3df12;hb=HEAD