Add WithEndpointURL option to OTLP over HTTP exporters #10115

Job	Run time
test-coverage	1m 3s
test-bench	57s
test-race	1m 40s
lint	1m 4s
compatibility-test (~1.21.3, ubuntu-latest, 386)	24s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	1m 1s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 12s
compatibility-test (~1.21.3, windows-latest, 386)	2m 28s
compatibility-test (~1.21.3, windows-latest, amd64)	4m 2s
compatibility-test (~1.20.10, ubuntu-latest, 386)	57s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	20s
compatibility-test (~1.20.10, macos-latest, amd64)	1m 6s
compatibility-test (~1.20.10, windows-latest, 386)	3m 8s
compatibility-test (~1.20.10, windows-latest, amd64)	4m 18s
test-compatibility	1s
	23m 41s

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