feat: add dynamic loading of variable #2083

Job	Run time
minimal	17s
check-cfg	23s
docs	33s
msrv	2m 30s
quickchecking	22s
rustfmt-clippy	13s
test-book	6s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	2m 13s
test-expectations (ubuntu-latest)	48s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 9s
test-expectations (macos-latest)	3m 45s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 48s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 46s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 51s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 17s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 22s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 10s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	2m 36s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	2m 27s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	3m 6s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	2m 28s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	3m 0s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	3m 4s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	3m 4s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	3m 2s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 53s
test (macos-latest, 9.0, 0, 0, 0)	1m 42s
success	1s
	52m 56s

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