[remote-storage][v2] Add proto definition for `GetTraces` rpc #1757

Job	Run time
badger / badger (v1)	2m 18s
badger / badger (v1)	2m 18s
badger / badger (v2)	4m 20s
badger / badger (v2)	4m 20s
cassandra / cassandra-4.x v1 schema=manual	6m 3s
cassandra / cassandra-4.x v1 schema=manual	6m 3s
elasticsearch / elasticsearch 6.x v1	5m 50s
elasticsearch / elasticsearch 6.x v1	5m 50s
cassandra / cassandra-5.x v1 schema=manual	5m 57s
cassandra / cassandra-5.x v1 schema=manual	5m 57s
elasticsearch / elasticsearch 7.x v1	6m 9s
elasticsearch / elasticsearch 7.x v1	6m 9s
cassandra / cassandra-4.x v2 schema=manual	8m 5s
cassandra / cassandra-4.x v2 schema=manual	8m 5s
grpc / grpc (v1)	2m 28s
grpc / grpc (v1)	2m 28s
elasticsearch / elasticsearch 8.x v1	9m 17s
elasticsearch / elasticsearch 8.x v1	6m 41s
cassandra / cassandra-5.x v2 schema=manual	7m 53s
cassandra / cassandra-5.x v2 schema=manual	7m 53s
grpc / grpc (v2)	4m 33s
grpc / grpc (v2)	4m 33s
elasticsearch / elasticsearch 8.x v2	6m 18s
elasticsearch / elasticsearch 8.x v2	6m 18s
cassandra / cassandra-4.x v2 schema=auto	7m 45s
cassandra / cassandra-4.x v2 schema=auto	7m 45s
cassandra / cassandra-5.x v2 schema=auto	8m 1s
cassandra / cassandra-5.x v2 schema=auto	8m 1s
kafka / kafka 3.x v1	2m 30s
kafka / kafka 3.x v1	2m 30s
kafka / kafka 3.x v2	5m 17s
kafka / kafka 3.x v2	5m 17s
memory / memory-v2	4m 10s
memory / memory-v2	4m 10s
opensearch / opensearch 1.x v1	6m 3s
opensearch / opensearch 1.x v1	6m 3s
opensearch / opensearch 2.x v1	6m 1s
opensearch / opensearch 2.x v1	6m 1s
opensearch / opensearch 2.x v2	6m 30s
opensearch / opensearch 2.x v2	6m 30s
	3h 48m 20s

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