feat(loadgen): adding loadgen binary #2663

Job	Run time
Detect code changes	4s
Determine Image Tag	4s
proto / buf-check	10s
test / Go Mod Tidy Check	31s
test / Build All ev-node Binaries	2m 55s
lint / hadolint	11s
test / Run Unit Tests	4m 30s
lint / goreleaser-check	10s
test / Run Integration Tests	2m 5s
lint / markdown-lint	4m 0s
lint / golangci-lint	1m 28s
lint / yamllint	13s
docker / Build ev-node-testapp	23m 14s
docker / Build ev-node-grpc	20m 23s
docker / Build ev-node-evm	20m 49s
docker / Build ev-node-loadgen	17m 15s
test / Run EVM Execution Tests	2m 13s
test / Run E2E System Tests	12m 39s
test / Combine and Upload Coverage	7s
docker-tests / Docker Upgrade E2E Tests	4m 7s
docker-tests / Docker Compatibility E2E Tests	4m 30s
docker-tests / Docker E2E Tests	7m 49s
	2h 9m 27s

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