feat(examples): add rpc example with twirp #1953

Job	Run time
generate-matrix-with-packages	5s
test-windows	6m 19s
test (18.x, artillery)	5m 50s
test (18.x, artillery-engine-playwright)	1m 41s
test (18.x, artillery-engine-posthog)	1m 0s
test (18.x, artillery-plugin-apdex)	1m 17s
test (18.x, artillery-plugin-ensure)	2m 3s
test (18.x, artillery-plugin-expect)	1m 33s
test (18.x, artillery-plugin-fake-data)	1m 0s
test (18.x, artillery-plugin-memory-inspector)	1m 40s
test (18.x, artillery-plugin-metrics-by-endpoint)	1m 20s
test (18.x, artillery-plugin-publish-metrics)	58s
test (18.x, artillery-plugin-slack)	59s
test (18.x, @artilleryio/int-commons)	59s
test (18.x, @artilleryio/int-core)	6m 8s
test (18.x, skytrace)	59s
test (18.x, @artilleryio/types)	1m 11s
test (20.x, artillery)	5m 18s
test (20.x, artillery-engine-playwright)	1m 29s
test (20.x, artillery-engine-posthog)	50s
test (20.x, artillery-plugin-apdex)	1m 12s
test (20.x, artillery-plugin-ensure)	1m 53s
test (20.x, artillery-plugin-expect)	1m 24s
test (20.x, artillery-plugin-fake-data)	55s
test (20.x, artillery-plugin-memory-inspector)	1m 34s
test (20.x, artillery-plugin-metrics-by-endpoint)	1m 13s
test (20.x, artillery-plugin-publish-metrics)	1m 1s
test (20.x, artillery-plugin-slack)	53s
test (20.x, @artilleryio/int-commons)	48s
test (20.x, @artilleryio/int-core)	6m 1s
test (20.x, skytrace)	47s
test (20.x, @artilleryio/types)	1m 0s
	1h 1m 20s

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