Unity Catalog and Labs CLI Support

[ravi-databricks]

Unity Catalog Support

• Added uc_enabled flag so that existing customers wont face any issues
• Based on uc_enabled flag Onboarding and DataflowPipeline will use paths or uc namespaces
• Created integration tests framework which can be used to launch demos
• Added integration tests for uc
• Modified existing demos to incorporate unity catalog and integration test framework
• Added unit test coverage for Dataflowpipeline
• Modified documentation

Databricks Labs CLI Support

Added two commands for DLT-META

• onboard: Captures all onboarding details from command line and launch onboarding job to your databricks workspace
• deploy: Captures all DLT pipeline details from command line and launch DLT pipeline to your databricks workspace
• Customers can use onboard and deploy as API if dlt-meta is installed using pypi

[codecov[bot]]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (f5f6c34) 85.00% compared to head (b0e2e31) 90.28%.

Files	Patch %	Lines
src/onboard_dataflowspec.py	94.28%	4 Missing :warning:
src/dataflow_pipeline.py	93.33%	1 Missing and 2 partials :warning:
src/__main__.py	83.33%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #28 +/- ## ========================================== + Coverage 85.00% 90.28% +5.28% ========================================== Files 7 8 +1 Lines 740 803 +63 Branches 128 149 +21 ========================================== + Hits 629 725 +96 + Misses 61 31 -30 + Partials 50 47 -3 ``` | [Flag](https://app.codecov.io/gh/databrickslabs/dlt-meta/pull/28/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=databrickslabs) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/databrickslabs/dlt-meta/pull/28/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=databrickslabs) | `90.28% <93.23%> (+5.28%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=databrickslabs#carryforward-flags-in-the-pull-request-comment) to find out more.

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