Create a TypeContributor that registers all supported types

[vladmihalcea]

As mentioned by @jwgmeligmeyling on my blog:

Perhaps we should provide a basic implementation for MetadataBuilderContributor in hibernate-types? Although some of the types may not be able to load due to missing classes on the classpath. We’d have to use some reflection for that. On the other hand, pointing people to the MetadataBuilderContributor may make hibernate-types easier to use. The typedefs grow quite old after a while…

We could perhaps even register the MetadataBuilderContributor using the service provider API, although this might have too many side effects.

There could be a predefined MetadataBuilderContributor containing all supported types.

It should be tested to see if registering MetadataBuilderContributor by default via the Service Loader mechanism is safe.

[vladmihalcea]

Fixed.