misc: Add support of array in map

[vincent-pochet]

This PR adds the support of any type for Clickhouse Map key or value

Example:

create_table :my_table do |t|
  t.map :filters, key_type: :string, value_type: 'Array(String)', null: false
  t.map :grouped_by, key_type: :string, value_type: :string, null: false
end