[HUDI-2319] dbt example models to demonstrate hudi dbt integration

[vingov]

What is the purpose of the pull request

This PR demonstrates hudi integration with dbt, it has a few models to demonstrate the different ways in which you can create hudi datasets using dbt.

Brief change log

• Example dbt models to demonstrate how to use hudi with dbt

Verify this pull request

This change added tests and can be verified as follows:

• *Follow the instructions described in the readme.md file in this PR.

Committer checklist

• Has a corresponding JIRA in PR title & commit

• Commit message is descriptive of the change

• CI is green

• Necessary doc changes done or have another open PR

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[hudi-bot]

CI report:

• 554f8e1 Azure: SUCCESS

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build