Add an option to configure the exporter buffer of the BatchProcessor #14615

Job	Run time
lint	2m 12s
test-bench	45s
test-concurrent-safe	3m 58s
test-race	2m 1s
compatibility-test (1.23.0, ubuntu-latest, 386)	1m 11s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 13s
compatibility-test (1.23.0, macos-13, amd64)	2m 13s
compatibility-test (1.23.0, macos-latest, arm64)	37s
compatibility-test (1.23.0, windows-latest, 386)	1m 52s
compatibility-test (1.23.0, windows-latest, amd64)	2m 35s
compatibility-test (1.23.0, actuated-arm64-2cpu-8gb, arm64)	38s
compatibility-test (~1.22.5, ubuntu-latest, 386)	22s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 6s
compatibility-test (~1.22.5, macos-13, amd64)	1m 56s
compatibility-test (~1.22.5, macos-latest, arm64)	49s
compatibility-test (~1.22.5, windows-latest, 386)	1m 51s
compatibility-test (~1.22.5, windows-latest, amd64)	2m 52s
compatibility-test (~1.22.5, actuated-arm64-2cpu-8gb, arm64)	1m 50s
test-coverage	54s
codecov	7s
test-compatibility	1s
	31m 3s

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