Put types in their own namespace

[phiresky]

I think it would be better to name the types more exactly like their pg counterparts e.g.

import {types as t} from '@hediet/typed-sql';
t.smallint
t.integer
t.bigint
t.decimal
t.numeric
t.real
t.double_precision

[hediet]

But what about other database drivers? I don't have a strategy for being database independent yet.

[phiresky]

Might be a good idea to separate the postgresql stuff (adapter and type definitions) into a separate package like @hediet/typed-sql-postgres. or @typed-sql/postgres

Not sure how the serializer / etc can be shared between different databases.