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This adds a mappings CompressedXContent object to each DataStream. This mappings object is serialized into the cluster state, and exposed via a getMappings(), getEffectiveMappings(), and getEffectiveIndexTemplate() methods . Right now it is not used by anything, but will be in subsequent PRs.
The code in this PR is not behind a feature flag, because there is no way for the code to have any user-facing impact, since there is no way yet to actually set a mapping on a data stream. The next PR will add the transport actions for getting and setting the mapping. The final PR will add the rest actions, API spec, and yaml rest tests. That will be behind a feature flag.