Add selector of exemplar reservoir providers to metric.Stream configuration #14670

Job	Run time
lint	2m 11s
test-bench	44s
test-race	2m 3s
compatibility-test (1.23.0, ubuntu-latest, 386)	22s
compatibility-test (1.23.0, ubuntu-latest, amd64)	1m 16s
compatibility-test (1.23.0, macos-13, amd64)	2m 59s
compatibility-test (1.23.0, macos-latest, arm64)	32s
compatibility-test (1.23.0, windows-latest, 386)	1m 46s
compatibility-test (1.23.0, windows-latest, amd64)	3m 21s
compatibility-test (1.23.0, actuated-arm64-2cpu-8gb, arm64)	1m 58s
compatibility-test (~1.22.5, ubuntu-latest, 386)	27s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 3s
compatibility-test (~1.22.5, macos-13, amd64)	1m 58s
compatibility-test (~1.22.5, macos-latest, arm64)	28s
compatibility-test (~1.22.5, windows-latest, 386)	2m 14s
compatibility-test (~1.22.5, windows-latest, amd64)	2m 23s
compatibility-test (~1.22.5, actuated-arm64-2cpu-8gb, arm64)	1m 53s
test-concurrent-safe	3m 57s
test-coverage	57s
codecov	8s
test-compatibility	1s
	32m 41s

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