Duplicate migration prompt #42
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I noticed when running the provided generators that created migrations, if there is any sort of error that required me to run the generator again, it would create a duplicate migration since the timestamp prefix of the migration file name would be different (it would not register as a duplicate file). This PR adds a prompt to alert the user that a version of the migration already exists and, if they choose to create the migration a second time may result in a migration error in the database since the columns/table would already exist.