Add an option to configure the exporter buffer of the BatchProcessor #14610

Job	Run time
lint	2m 6s
test-concurrent-safe	3m 58s
test-bench	45s
test-race	2m 5s
test-coverage	57s
compatibility-test (1.23.0, ubuntu-latest, 386)	1m 16s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 21s
compatibility-test (1.23.0, macos-13, amd64)	2m 21s
compatibility-test (1.23.0, macos-latest, arm64)	35s
compatibility-test (1.23.0, windows-latest, 386)	1m 44s
compatibility-test (1.23.0, windows-latest, amd64)	2m 35s
compatibility-test (1.23.0, actuated-arm64-2cpu-8gb, arm64)	40s
compatibility-test (~1.22.5, ubuntu-latest, 386)	27s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 2s
compatibility-test (~1.22.5, macos-13, amd64)	3m 14s
compatibility-test (~1.22.5, macos-latest, arm64)	43s
compatibility-test (~1.22.5, windows-latest, 386)	1m 44s
compatibility-test (~1.22.5, windows-latest, amd64)	2m 40s
compatibility-test (~1.22.5, actuated-arm64-2cpu-8gb, arm64)	1m 59s
codecov	11s
test-compatibility	1s
	32m 24s

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