[Rpm-maint] [rpm-software-management/rpm] Implement alternative transaction callback style (#1365)

[Panu Matilainen]

Updated for various fixes (mostly on Python side):
- not all callbacks have a transaction element (so we must pass None there)
- make callback style a persistent ts property so support is easier to test for and doesn't need to be set for every ts.run() call
- add a brief testcase to demonstrate the python args (old and new)

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