fix, python + ts: additional template bugs

[armandobelardo]

Before this PR:

• The union templates had the incorrect location
• The certain fields in python were missing a location
• We were not making literals as union members
• TS was not correctly making object all the time

Of note:
The undiscriminated union template takes a location directly on it, the idea here is the resolver grabs that payload and passes it into the members to score and resolve those templates.
That means that the members themselves need to be relative templates (relative to the payload grabbed from the union template itself), and the union itself needs to pass in the payload at it's given location (e.g. what JSON object represents all the union members)