add go/starlark helper methods for dataconv/types types

[hyorigo]

• more helpers on that
• add empty

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.03% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (4ef73d8cb28ec208b47e1baf0f89aa713f7ac075) | 4714 | 4376 | 92.83% | | | Head commit (f3243992fcaf30ce0c466e84a070c2398ebc6ba6) | 4735 (+21) | 4397 (+21) | 92.86% (**+0.03%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#105) | 26 | 26 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

See your quality gate settings    Change summary preferences

---

_{:rocket: Don’t miss a bit, follow what’s new on Codacy.}

_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.39%. Comparing base (4ef73d8) to head (f324399).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #105 +/- ## ========================================== + Coverage 90.35% 90.39% +0.03% ========================================== Files 40 40 Lines 4570 4589 +19 ========================================== + Hits 4129 4148 +19 Misses 332 332 Partials 109 109 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.