[realppl 9] realppl public api and integration tests

[wu-hui]

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[google-oss-bot]

	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

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[cherylEnkidu]

Hi Andy, I remember in the discussion we decided to avoid using generic and go with RealtimePipelineSource ?

[cherylEnkidu]

There are some source, for example database is not available for the realtime ppl (although we can relay on runtime checking)