Add a 'uuid' database schema type

For now just a re-roll for #3315604: Move remaining database specific kernel tests to the driver modules → . Will try to find some time to reply to #65 properly at some point, but just as a quick note: This patch would not change anything for core and for contrib it's just enablement to be able to experiment and validate with in contrib and eventually in core. Because the Schema API is not in any alterable or extendable, it is necessary to take this first step in order to get something for people to build on.

Oops, this one should be better.

For SQLite we are going to store it BLOB's. Why is that better than how we are storing it now?

Re #65 There's few choices

- https://www.sqlite.org/lang_corefunc.html#randomblob for binary representation, available since 3.3.13 but for 10.x we set 3.26 →
- check for uuid.c extension but available since 3.31 and not every linux distro i bet

There's no difference this days about binary/text storage but generation (when running migrations) could be affected

Also there could be some analysis in which way uuids are consumed by core, as I know most of places using it as string

btw there's great answer to sqlite data-type https://stackoverflow.com/a/10105431

CR is incomplete

oracle and mssql drivers should use change record to add compatibility, for BC it could be CHAR(36)