Koala-1245 | feat(convert-without-catalog): implementation & tests for convert without catalog

[matanmichaely]

Context

context was shared in this pr

Changes

• In generator.py - added missing data type in Looker types dict
• Under core package added the following with the relevant implementation , it's required for avoid usage of exposure logic
  • models.py
  • generator.py
• Added unit tests for the new modules.

Prerequisites for integration test

• For convert method under converter.py module "integration" test was added
• Under tests/resources/core added expected_lookml & test_target folders
• In expected_lookml and generated_lookml folders new generated Looker views were added.
• In test_target/manifest.json I did the following changes
  • Update model columns' data type attribute from type -> data_type
  • For 7 models I added yoda_looker model tag (under config) which marks them as model for conversion.