Treat pandas as an optional dependency (#489)

[gs11]

What type of PR is this?

• Refactor
• Feature
• Bug Fix
• Other

Description

This naive PR changes pandas to be an optional dependency - just like pyarrow.
Tests fail but seemingly due to unrelated things.

How is this tested?

• Unit tests
• E2E Tests
• Manually
• N/A

Related Tickets & Documents

#489

[gs11]

Any chance to get this reviewed?
@deeksha-db @samikshya-db @jprakash-db @yunbodeng-db @jackyhu-db @benc-db

[FBruzzesi]

Hey @gs11 thanks for addressing this, I just realized about your PR.
To close #489 you should make sure to avoid importing pandas as top level import in src/databricks/sql/client.py. That would have been my strategy.

I really hope this gets through eventually

[gs11]

To close #489 you should make sure to avoid importing pandas as top level import in src/databricks/sql/client.py. That would have been my strategy.

Thanks! @FBruzzesi I realize this change wasn't pushed properly to my branch. Updated it as well as rebased to resolve the poetry.lock conflict issues due to upstream being updated.