[exporter] moved mergeBatchFunc and mergeBatchSplitFunc to request (#… #72

Job	Run time
govulncheck	28s
setup-environment	8s
lint	4m 5s
test-coverage	5m 55s
checks	1m 58s
unittest-matrix (ubuntu-latest, ~1.23)	2m 11s
cross-build-collector (darwin, amd64)	50s
unittest-matrix (ubuntu-latest, ~1.22)	2m 18s
cross-build-collector (darwin, arm64)	47s
cross-build-collector (linux, 386)	44s
cross-build-collector (linux, amd64)	42s
cross-build-collector (linux, arm64)	48s
cross-build-collector (linux, ppc64le)	54s
cross-build-collector (linux, arm, 7)	40s
cross-build-collector (linux, s390x)	46s
cross-build-collector (windows, 386)	46s
cross-build-collector (windows, amd64)	56s
unittest	1s
	24m 57s

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