feat(blobstream): utilizes sdk.Dec type for power difference calculation #2303

Job	Run time
goreleaser-check	8s
lint / golangci-lint	1m 34s
markdown-linter / markdown-link-check	2m 2s
lint / yamllint	9s
test / test	13m 27s
markdown-linter / markdown-lint	8s
test / test-coverage	3m 48s
test / test-race	8m 8s
test / test-short	3m 7s
lint / hadolint / hadolint	11s
version_bump	5s
goreleaser	0s
	32m 47s

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