Add infrastructure for supporting multiple token slots per unlock method #5555

Job	Run time
checks (make -f Makefile fmt-ci, 1.83.0, rustfmt)	41s
checks (make -f Makefile check-typos, 1.83.0, cargo)	39s
python-based-tests	2m 10s
pylint	38s
shell-checks	18s
stratis-cli-checks	8m 32s
stratis-min-cli-checks	2m 13s
tests-with-testing-repo (HEAD, --post-test-check=verify-filesystem-symlinks --post-test-check=ver...	28m 35s
tests-with-testing-repo (v3.6.2, --highest-revision-number=6)	28m 48s
	1h 12m 34s

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