fix(ingest): bigquery-beta - handling complex types properly

[treff7es]

• Handling complex types properly
• Complex type descriptions added properly.

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

[treff7es]

[github-actions]

Unit Test Results (build & test)

584 tests  ±0   580 ✔️ ±0   12m 53s ⏱️ +6s
143 suites ±0       4 💤 ±0 
143 files   ±0       0 ❌ ±0 

Results for commit 7f334ce. ± Comparison against base commit 7da2e98.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results (metadata ingestion)

    7 files  ±0      7 suites  ±0   1h 4m 54s ⏱️ + 1m 1s
719 tests ±0  715 ✔️ ±0  3 💤 ±0  1 ❌ ±0 
773 runs  ±0  766 ✔️ ±0  6 💤 ±0  1 ❌ ±0 

For more details on these failures, see this check.

Results for commit 7f334ce. ± Comparison against base commit 7da2e98.

♻️ This comment has been updated with latest results.

[shirshanka]

LGTM