sdk/metric: Add experimental Enabled method to synchronous instrument… #15153

Job	Run time
lint	2m 13s
compatibility-test (1.23.0, ubuntu-latest, 386)	1m 8s
test-bench	29s
compatibility-test (1.23.0, ubuntu-latest, amd64)	29s
test-concurrent-safe	3m 59s
compatibility-test (1.23.0, otel-linux-arm64, arm64)	37s
test-coverage	42s
compatibility-test (1.23.0, macos-13, amd64)	1m 40s
test-race	2m 9s
compatibility-test (1.23.0, macos-latest, arm64)	35s
compatibility-test (1.23.0, windows-latest, 386)	1m 42s
compatibility-test (1.23.0, windows-latest, amd64)	2m 55s
compatibility-test (~1.22.5, ubuntu-latest, 386)	25s
compatibility-test (~1.22.5, ubuntu-latest, amd64)	1m 12s
compatibility-test (~1.22.5, otel-linux-arm64, arm64)	34s
compatibility-test (~1.22.5, macos-13, amd64)	1m 41s
compatibility-test (~1.22.5, macos-latest, arm64)	36s
compatibility-test (~1.22.5, windows-latest, 386)	2m 14s
compatibility-test (~1.22.5, windows-latest, amd64)	1m 28s
codecov	7s
test-compatibility	1s
	26m 56s

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