[CT-3255] [implementation] interface changes to dbt-core saved_query spec to add export

[graciegoheen]

Housekeeping

• I am a maintainer of dbt-core

Short description

Add exports to saved_query

saved_queries:
  - name: my_query
    description:
    query:
      metrics:
        - 
      group_bys:
        - TimeDimension()
        - ...
      where:
        - 
    exports:
      - name: my_query 
        config:
          export_as: table # options: table, view - FUTURE: incremental_table, window_table, file
          schema: my_schema  # [optional - DEFAULT to deployment schema]
          alias: some_table_name # [optional - DEFAULT to export name]

Acceptance criteria

• add exports to saved_query

Impact to Other Teams

SL

Will backports be required?

1.7 latest

Context

No response

[QMalcolm]

The hierarchical config calculation part of this has been pushed to #8956