feat(ingest): make sink use type annotations

[hsheth2]

Overall this should reduce the amount of code required to define a sink type.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (metadata ingestion)

       8 files         8 suites   57m 50s ⏱️
   688 tests    682 ✔️ 3 💤 3 ❌
1 376 runs  1 364 ✔️ 6 💤 6 ❌

For more details on these failures, see this check.

Results for commit 368182d.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results (build & test)

571 tests  ±0   571 ✔️ ±0   14m 29s ⏱️ -44s
141 suites ±0       0 💤 ±0 
141 files   ±0       0 ❌ ±0 

Results for commit 368182d. ± Comparison against base commit afa5888.

[shirshanka]

LGTM