[exporterhelper] Add default batching for OTLP data type #18258

Job	Run time
govulncheck	29s
setup-environment	16s
lint	2m 34s
test-coverage	4m 50s
unittest-matrix (~1.22)	3m 21s
checks	46s
unittest-matrix (~1.21.8)	3m 24s
cross-build-collector (darwin, amd64)	49s
cross-build-collector (darwin, arm64)	43s
cross-build-collector (linux, 386)	47s
cross-build-collector (linux, amd64)	43s
cross-build-collector (linux, arm64)	46s
cross-build-collector (linux, ppc64le)	44s
cross-build-collector (linux, arm, 7)	42s
cross-build-collector (linux, s390x)	42s
cross-build-collector (windows, 386)	42s
cross-build-collector (windows, amd64)	48s
unittest	1s
	23m 7s

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