Primary Key Migration Woes

[parsonsmatt]

This PR tracks #906

Test suite demonstrates problems

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[parsonsmatt]

Adding a primary key to a column is definitely not safe, because it's like adding a unique key to a column.

[parsonsmatt]

Currently fails on sqlite with:

      src/MigrationTest.hs:68:9: 
      2) Migration, Add Primary key constraint on raw table, works
           uncaught exception: SqliteException
           SQLite3 returned ErrorError while attempting to perform prepare "INSERT INTO \"from_raw_migration_backup\"(\"id\",\"name\",\"age\") SELECT \"id\",\"name\",\"age\" FROM \"from_raw_migration\"": table from_raw_migration_backup has no column named id
    
      To rerun use: --match "/Migration/Add Primary key constraint on raw table/works/"