[exporterhelper] Add batch sender #15067

Job	Run time
govulncheck	2m 1s
setup-environment	45s
test-coverage	3m 34s
lint	4m 50s
cross-build-collector (darwin, amd64)	1m 25s
unittest-matrix (~1.21.3)	2m 29s
checks	2m 41s
cross-build-collector (darwin, arm64)	1m 10s
unittest-matrix (~1.20.10)	1m 39s
cross-build-collector (linux, 386)	1m 24s
cross-build-collector (linux, amd64)	1m 6s
cross-build-collector (linux, arm64)	1m 16s
cross-build-collector (linux, ppc64le)	1m 19s
cross-build-collector (linux, arm, 7)	1m 3s
cross-build-collector (linux, s390x)	1m 6s
cross-build-collector (windows, 386)	1m 13s
cross-build-collector (windows, amd64)	1m 50s
unittest	3s
	30m 54s

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