Add ApproveFields for approving flattened fields #30
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ApproveFields approves flattened fields, including runtime fields, rather than document _source.
We also add cmd/flatten-approvals for converting existing _source-based approvals to flattened fields. The results may not be perfectly aligned with the results of using ApproveFields (e.g. we can't materialise runtime fields from source in this way), but this gives us a way to perform a mechanical translation before switching to ApproveFields, minimising the non-mechanical diff.
Required for elastic/apm-server#12066, which moves some processing out of ingest pipelines and into indexed runtime fields.