Consolidate primary and federated metastores into a single metastore type

[AnanaMJ]

The configuration for a primary metastore has became increasingly similar to the configuration for a federated metastore over time, to the point where there are duplications in the documentation for the options to configure a metastore. It would reduce confusion to have only one type of metastore and discard the distinction between "primary" and "federated".

Crucially this needs to be done in a way that ensures that the differences in configuration for a "primary" database can still be applied.Currently, there are few exceptions in duplications:

• database-prefix (ignored for primary metastore)
• access-control-type (fewer options for federated metastore)
• mapped-databases (not an option for primary metastore)

These will need to be available across both types before they can be combined.