Flutter: Don't match the filter

Finds all rows which doesn't satisfy the filter.

Examples

With `select()`

final data = await supabase
  .from('cities')
  .select('name, country_id')
  .not('name', 'eq', 'Paris');

With `update()`

final data = await supabase
  .from('cities')
  .update(\{ 'name': 'Mordor' \})
  .not('name', 'eq', 'Paris');

With `delete()`

final data = await supabase
  .from('cities')
  .delete()
  .not('name', 'eq', 'Paris');

With `rpc()`

// Only valid if the Stored Procedure returns a table type.
final data = await supabase
  .rpc('echo_all_cities)
  .not('name', 'eq', 'Paris');