Support ALL Postgres Functions. `to_timestamp` not supported

[samjewell]

What version of Chai are you using?

$ chai version
v0.16.0

What did you do?

I tried to use to_timestamp():

db.Query(`SELECT to_timestamp(1)  AS n;`)

And got an error:

no such function: "to_timestamp"

What did you expect to see?

The Docs say:

ChaiSQL SQL API is compatible with PostgreSQL

So I expected ALL the Postgres Date/Time functions and operators (see docs: https://www.postgresql.org/docs/current/functions-datetime.html), but to_timestamp() definitely doesn't exist.