This adds a new `Builder` type that can now be used to construct the
`Database` type. This will scale better as we add more varied options.
This commit also deprecates the old builder types and will produce a
warning that will push users to using the new `Builder` type. This will
then allow us to remove the old deprecated constructors at some point in
the future.
This PR adds a new internal metadata store for namespace configuration.
This internally uses a normal namespace so that the replica also get's
synchronized. This is just initial work there are a few more issues to
solve regarding replica's getting updated configs and some internal
hardening that needs to be done. Tracking issue for follow up work #768.
Closes#501
