feat: initialize fswap module #4027

Job	Run time
build (amd64, gcc)	1m 9s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	2m 0s
cleanup-runs	7s
install-tparse	13s
test-cosmovisor	2m 50s
split-test-files	13s
tests (00)	3m 44s
test-race (00)	3m 45s
tests (01)	4m 39s
test-race (01)	3m 18s
tests (02)	5m 2s
test-race (02)	1m 58s
tests (03)	3m 35s
test-race (03)	2m 16s
upload-coverage-report	31s
	35m 20s

Provide feedback