feat: use go embed for swagger #3446

Job	Run time
install-tparse	14s
cleanup-runs	6s
build (amd64, gcc)	21s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	1m 31s
split-test-files	20s
test-cosmovisor	3m 54s
tests (00)	7m 16s
tests (01)	7m 32s
tests (02)	5m 8s
test-race (00)	6m 22s
test-race (01)	6m 30s
tests (03)	3m 28s
test-race (02)	2m 1s
test-race (03)	4m 7s
upload-coverage-report	20s
	49m 10s

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