[FEATURE]: Add custom bundle templates for initialising pipeline bundles

[liamperritt]

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Problem statement

Creating pipeline bundles from these templates currently requires manual customisation after copy/pasting.

Proposed Solution

Add custom Databricks bundle templates so that customers can use databricks bundle init and point to the relevant template in the framework repo to initialise pipeline bundles via interactive parameter entry.

Additional Context

See: https://docs.databricks.com/aws/en/dev-tools/bundles/template-tutorial