chore: adds transactional memory store (#103) #172

Job	Run time
test-contract-tests	2m 56s
test-packaging	3m 59s
test-platforms-and-versions (ubuntu-latest, 19)	2m 33s
test-platforms-and-versions (ubuntu-latest, 11)	2m 40s
test-platforms-and-versions (ubuntu-latest, 17)	2m 27s
test-platforms-and-versions (ubuntu-latest, 8)	2m 39s
	17m 14s

Provide feedback