Submit scala jobs beta

[pekapa]

Problem

Starting on version 1.3 DBT Python models became available. Another very common programming language for submitting spark jobs is Scala. This PR enables Scala models to be built with DBT

Solution

Using the structure created by Python models we can extend it to also support Scala models. The parser for Scala is not widely available so a "cheap" version was built to provide just the minimum needed for it. More complex solutions (using ANTLR, for example) might be desired in the future. Since the Python validator is missing tests we are also skipping those for now here. Same for typed annotations, it follows the precedent set by the Python models code.

Related dbt-core PR: dbt-labs/dbt-core/pull/8701

Checklist

• [x] I have read the contributing guide and understand what's expected of me
• [x] I have run this code in development and it appears to resolve the stated issue
• [x] This PR includes tests, or tests are not required/relevant for this PR
• [ ] This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• [ ] This PR includes type annotations for new and modified functions

[github-actions[bot]]

This PR has been marked as Stale because it has been open with no activity as of late. If you would like the PR to remain open, please comment on the PR or else it will be closed in 7 days.

[github-actions[bot]]

Although we are closing this PR as stale, it can still be reopened to continue development. Just add a comment to notify the maintainers.