Add infrastructure for supporting multiple token slots per unlock method #5538

Job	Run time
pylint	20s
checks (make -f Makefile fmt-ci, 1.83.0, rustfmt)	44s
checks (make -f Makefile check-typos, 1.83.0, cargo)	47s
python-based-tests	2m 13s
stratis-cli-checks	8m 25s
shell-checks	23s
stratis-min-cli-checks	2m 25s
tests-with-testing-repo (HEAD, --post-test-check=verify-filesystem-symlinks --post-test-check=ver...	28m 39s
tests-with-testing-repo (v3.6.2, --highest-revision-number=6)	28m 35s
	1h 12m 31s

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