refactor request struct

broker/src/asapo_broker/database/database.go

broker/src/asapo_broker/database/encoding.go

broker/src/asapo_broker/database/encoding_test.go

broker/src/asapo_broker/database/mongodb.go

broker/src/asapo_broker/database/mongodb_streams.go

broker/src/asapo_broker/database/mongodb_test.go

broker/src/asapo_broker/database/streams_test.go

broker/src/asapo_broker/server/get_commands_test.go

broker/src/asapo_broker/server/get_meta_test.go

broker/src/asapo_broker/server/post_op_image_test.go

broker/src/asapo_broker/server/post_query_images_test.go

broker/src/asapo_broker/server/post_reset_counter_test.go

broker/src/asapo_broker/server/process_request.go

broker/src/asapo_broker/server/process_request_test.go

common/go/src/asapo_common/logger/logger.go