Add declarative config support for RuleBasedRoutingSampler #2808

Job	Run time
integration-test	50s
build	1m 5s
test (8)	1m 11s
test (11)	1m 3s
test (17)	6m 1s
test (20)	1m 4s
markdown-link-check / markdown-link-check	1m 42s
markdown-lint-check / markdown-lint-check	8s
misspell-check / misspell-check	3s
shell-script-check / shell-script-check	3s
required-status-check	1s
publish-snapshots (skipped)	5s
	13m 16s

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