v0.4.0: Add streaming support and improve onboarding experiences

[hangfei]

In this release, we have accomplished:

1. Feature streaming. Now you can transform your raw data from a streaming source and ingest the features into your online store in a much faster way compared with offline ingestion.
2. A lot of improvements on our documentation, including Feathr Concepts for Beginners and Python API documentation.
3. Improved new user installation and onboarding experiences.

Highlighted Changes

• Add streaming support by @jaymo001 in Add streaming support #137
• Python API documentation is available now at https://feathr.readthedocs.io/en/latest/ by @hangfei in [feathr] Update python docs #194 and Code format with the right subfolders #198
• Add Customer360 view notebook sample for easier user onboarding in Add sample notebook using Feathr feature store for Customer 360 view #132
• Lay foundation for FeatureRegistry APIs by @jainr Add REST API support for feature registry #99
• Use Databrics CLI to replace the Rest API for easier installation @xiaoyongzhu Use Databricks CLI instead of REST APIs #180

New Community Contributors

• @Dongbumlee made their first contribution in Adding Bicep files for deployment #130
• @chinmaytredence made their first contribution in Add sample notebook using Feathr feature store for Customer 360 view #132
• @blee1234 made their first contribution in Add sorting to Dense vector check #148
• @ahlag made their first contribution in Fixed spelling for user guide #188

Full Changelog: v0.3.0...v0.4.0

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