Add command to create a new migration file

[Sharaal]

Acceptance criteria

• To be similar to knex the name of the command should be migrate:make
• As parameter the name is supported
• If the name doesn't have a file ending, .sql is used as default
• The current unix timestamp is added as prefix to the name
• Depending on the file ending a different template is used as file content:
  • .js:

  module.exports = async sql => sql.query(
    sql``
  )
  

  • .sql: empty file