feat(zero): add support for timetz datatype

[GRBurst]

Based on the PR #4671 adding support for time datatype, this adds the timetz datatype. Interestingly, everything to do so was already in place (like the timetz type), so we only have to slightly extend existing logic.

You can find information about the pg types in postgres' datatype-date doc.

Tests were added to test the new behavior.

Note: time is actually time without timezone and therefore adding this would only adding the correct mapping. Hence the added code is mainly related to support timezones and is similar to the code that is in place for timestamp with timezone.

Edit:
I tested this PR in our application test setup and with our application now as well. I was previously facing the error:

 Error: Schema incompatibility detected between your zero schema definition and the database:
  - Type mismatch for column "time" in table "<mytable>": time without time zone is currently unsupported in Zero. Please file a bug at https://bugs.rocicorp.dev/
Please update your schema definition to match the database or migrate your database to match the schema.

This PR solves our problems (test passes with it and ui works) and removes a blocker for us. The outcome is as expected.

postgres	app ui

[vercel]

@GRBurst is attempting to deploy a commit to the Rocicorp Team on Vercel.

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[aboodman]

Thank you for this contribution! It seems reasonable to me. @darkgnotic should review it since he knows this code better.

[darkgnotic]

Cool, thank you @GRBurst!

I will pass this to @tantaman as he was the (real) reviewer of original support for the time type (#4671).