Nested maps, tuples, enums don't work

[FraterCRC]

Describe the bug
When you nest Tuple(Tuple) or Map(Enum) you get error

To Reproduce
CREATE TABLE color_map (
id UInt32,
colors Map(Enum('hello' = 1, 'world' = 2), String)
) ENGINE = Memory;
And try to compile type.
Expected behavior
Should be Map(Enum, String), we get error.

Versions
0.2, but code still wrong in new versions
python 3.10

[FraterCRC]

I see problem here:

elif spec.startswith('Tuple'):
          inner = spec[6:-1]
          coltype = self.ischema_names['_tuple']
          inner_types = [
              self._get_column_type(name, t.strip())
              for t in inner.split(',')
          ]
          return coltype(*inner_types)

      elif spec.startswith('Map'):
          inner = spec[4:-1]
          coltype = self.ischema_names['_map']
          inner_types = [
              self._get_column_type(name, t.strip())
              for t in inner.split(',', 1)
          ]
          return coltype(*inner_types)

It wont work good if the type is Tuple(Map(Type, Type), Type) because it will strip by ',' to ['Map(Type', 'Type)', 'Type']

[FraterCRC]

I wrote a function to split it and we use it in production.

@staticmethod
    def _split_inner(inner: str):
        start = 0
        result_split = []
        num_in_brackets = 0
        for idx, char in enumerate(inner):
            if char == ',' and not num_in_brackets:
                result_split.append(inner[start:idx].strip())
                start = idx + 1
            if char == ')' and num_in_brackets:
                num_in_brackets -= 1
            if char == '(':
                num_in_brackets += 1
        # asserting that there is something after last comma
        result_split.append(inner[start:].strip())
        return result_split