Add infrastructure for supporting multiple token slots per unlock method #5513

Job	Run time
checks (make -f Makefile fmt-ci, 1.83.0, rustfmt)	51s
pylint	23s
python-based-tests	1m 52s
checks (make -f Makefile check-typos, 1.83.0, cargo)	1m 1s
shell-checks	18s
stratis-cli-checks	1m 52s
stratis-min-cli-checks	1m 49s
tests-with-testing-repo (HEAD, --post-test-check=verify-filesystem-symlinks --post-test-check=ver...	1m 52s
tests-with-testing-repo (v3.6.2, --highest-revision-number=6)	1m 53s
	11m 51s

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