entity must exist in both the semantic models that the base_measure and conversion_measure are in
base_measure and conversion_measure must be valid and can only be SUM(1) or COUNT or DISTINCT_COUNT measures
In constant_properties, both property that is stated must be referencing either an existing dimension/entity in the respective base/conversion semantic model
Resolves #211
Description
Added validations for conversion metric configs.
Rules pulled from #211
Checklist
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