adding uc to snowflake operator

[ckonuganti]

Adding a new plugin to copy data from UC to snowflake and run snowflake queries.

Description

Added two plugins/operators to run snowflake queries and copy data from unity catalog to snowflake. these plugins helps us run the workloads from one environment instead of switching between dbx and sf. As a future enhancement , want to include support for more credential stores #70

Related Issue

63

Motivation and Context

As Enterprises might be using multiple solutions for data warehousing . we have a need to copy data from Unity Catalog to snowflake to support few scenarios. Instead of every team handling this common process in their own unique way, creating this plugin that can copy from UC table to Snowflake Table (Full Load, Incremental) and run queries directly on snowflake.

How Has This Been Tested?

We tested the code changes manually and documented(will attach screenshots). creating a new issue for automating the test cases #68.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

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

Comparison is base (fcf1b1c) 88.49% compared to head (78edd7f) 93.33%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #69 +/- ## ========================================== + Coverage 88.49% 93.33% +4.84% ========================================== Files 22 22 Lines 3189 4919 +1730 ========================================== + Hits 2822 4591 +1769 + Misses 367 328 -39 ```

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