Spark insert table bulk load

[anthonysena]

Fixes issues with insertTable() and bulk load with Spark (Databricks) that I introduced via #301.

[codecov]

Codecov Report

❌ Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.32%. Comparing base (3766c25) to head (0977eb4).

Files with missing lines	Patch %	Lines
R/BulkLoad.R	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #329      +/-   ##
===========================================
- Coverage    56.40%   56.32%   -0.09%     
===========================================
  Files           16       16              
  Lines         2732     2736       +4     
===========================================
  Hits          1541     1541              
- Misses        1191     1195       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[schuemie]

@anthonysena : note that this PR is marked as a work in progress, so cannot be merged yet

[anthonysena]

Correct - still testing this internally but wanted to file the PR for awareness.

[anthonysena]

Big thanks to @burrowse who did a lot of the work to connect up our Azure storage to Databricks to make this work!