Add Issue Templates. (#1347) #3582

Job	Run time
docs	11m 37s
external-types (opentelemetry)	1m 43s
cargo-deny	39s
external-types (opentelemetry-sdk)	1m 17s
coverage	17m 18s
lint	20m 47s
msrv	4m 32s
non-default-examples (opentelemetry-otlp/examples/external-otlp-grpcio-async-std)	5m 7s
test (stable)	16m 52s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	42s
test (beta)	38m 49s
	1h 59m 23s

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