Add API for bulk inserts

[essenciary]

For backends that support it. Similar to, for MySQL:

• LOAD DATA INFILE
• Bulk inserts (INSERT INTO): INSERT INTO class_result VALUES (1,’John’,’A’),(2,’Elsa’,’D’),(3,’Sophia’,’B’),(4,’Paul’,’B’),(5,’Saira’,’A’)

[honghuzi]

In the case of inserting a DataFrame to the SQLite database, it might be a good idea to use SQLite.jl package

  cols = [] # cols for the model definition
  db = SQLite.DB("db/temp.sqlite")
  n = count(MyModel)
  df = df[!, cols]
  df |> SQLite.load!(db, "temp")

[essenciary]

Yes - but the point is to have a common API for bulk inserts.