Replace string type with api call

[mweso-softserve]

Creates a macro that redefine type_string for models in dbt_project_evaluator package. No need to override it for all models in a project anymore when using package.

This is a:

• bug fix PR with no breaking changes
• new functionality

Link to Issue

Closes #469

Description & motivation

This implementation replaces type_string() macro which does't work for redshift for tables defined in the way it was implemented in dbt-project-evaluastor with api.Column.string_type(600)

Checklist

• I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • BigQuery
  • Postgres
  • Redshift
  • Snowflake
  • Databricks
  • DuckDB
  • Trino/Starburst
• I have updated the README.md (if applicable)
• I have added tests & descriptions to my models (and macros if applicable)

I tested that on a local version of this package without dispatcher configuration.

[b-per]

Closed with #475