feat: start work on uuid support

[iamwacko]

UUID was implemented as a string, which meant it would not work with the UUID type in databases. #270

[iamwacko]

If anyone wants this merged they have to figure out how to make pretty printing the OwnedSerializable in the test_compile_and_generate test in the core crate not give an error along the lines of key must be a string.

[ratskates]

Any chance of getting this merged in ? It's a read blocker for me.

[JRileyH]

What's the realistic timeline of getting this merged? I cannot use synth until UUIDs are supported in postgres.

Also thanks for taking his on @iamwacko :) Looks like more than a few people will be really happy to see this fixed.

[iamwacko]

I don't really have a schedule. It should be working, and rust-gdb even shows UUID's in memory. The only blocker is the key must be a string error, which I have spent hours trying to fix. If anyone could figure out how to deal with it I could put out a new release that day.

[njohnson-ml]

@iamwacko do you get any more info on the failure when you set RUST_BACKTRACE=1?

[murugesanp92]

@iamwacko any progress on this?