feat: move bls package under app/signer #99

Job	Run time
e2e-docker-build-e2e-init-chain	2m 41s
e2e-docker-build-babylon	3m 25s
proto_lint	28s
docker_pipeline / prepare-metadata	2s
lint_test / build	0s
lint_test / lint	1m 30s
lint_test / unit-tests	5m 19s
lint_test / check-mock-gen	0s
lint_test / gosec	0s
lint_test / integration-tests	0s
docker_pipeline / docker_build (linux/amd64, ubuntu-24.04)	3m 20s
docker_pipeline / docker_build (linux/arm64, ubuntu-24.04-arm64)	1s
e2e-run-btc-staking-pre-approval	2m 53s
e2e-run-btc-rewards	5m 18s
e2e-run-btc-staking	3m 28s
e2e-run-btc-timestamping	2m 48s
e2e-run-ibc-transfer	7s
e2e-run-upgrade-v1	15m 17s
docker_pipeline / merge_dockerhub	0s
docker_pipeline / merge_ecr	0s
	46m 37s

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