Add tests to validate spatial aggregation (#1416) #11

Job	Run time
docs	5m 37s
coverage	8m 23s
cargo-deny	26s
external-types (opentelemetry)	1m 4s
external-types (opentelemetry-sdk)	2m 54s
lint	20m 17s
msrv	5m 26s
non-default-examples (opentelemetry-otlp/examples/external-otlp-grpcio-async-std)	5m 9s
test (stable)	16m 21s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	42s
test (beta)	17m 11s
	1h 23m 30s

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