Feature planning: first class Go support

This is a tracking item for First Class Go Support. We'll be tracking the requirements and issues for first class Go support via this item. Feel free to leave comments about features/design patterns.

## Function format

**TBD**
## Data Type formats

**TBD**
## Version & Package management

**TBD**
## Testing/CI

**TBD**
## Change log

This is a tracking item for first-class Go support, but it names no implementation files, tests, or entry points. Start by reviewing the requirements and design discussion for function format, data types, version and package management, and testing/CI. The TBD sections need concrete decisions before implementation scope or completion criteria can be established.

Written by the indexing model from the issue text.