Add infrastructure for supporting multiple token slots per unlock method #5517

Job	Run time
checks (make -f Makefile fmt-ci, 1.83.0, rustfmt)	43s
pylint	24s
checks (make -f Makefile check-typos, 1.83.0, cargo)	55s
python-based-tests	2m 12s
shell-checks	25s
stratis-cli-checks	8m 32s
stratis-min-cli-checks	2m 30s
tests-with-testing-repo (HEAD, --post-test-check=verify-filesystem-symlinks --post-test-check=ver...	29m 24s
tests-with-testing-repo (v3.6.2, --highest-revision-number=6)	29m 10s
	1h 14m 15s

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