Flutter: Don't match the filter

Finds all rows which doesn't satisfy the filter.

Examples

With `select()`

final data = await supabase
  .from('instruments')
  .select('name, section_id')
  .not('name', 'eq', 'violin');

With `update()`

final data = await supabase
  .from('instruments')
  .update(\{ 'name': 'piano' \})
  .not('name', 'eq', 'guitar');

With `delete()`

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

With `rpc()`

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