GUI Implement basic types: str, int, float, bool

[e3rd]

This would create a simple form:

#!/usr/bin/env python3
from dataclasses import dataclass
from mininterface import run

@dataclass
class Env:
    foo1: str
    foo2: int
    foo3: float
    foo4: bool


m = run(Env)
print(m.env)
quit()

Some complex fields (like datetime) are re-created here; re-create also basic types str, int, float, bool:

mininterface/mininterface/_tk_interface/utils.py

Line 261 in a9c4c70

grid_info = replace_variable(variable)

So that we might suppress the dependency on tkinter_form library (which seems stuck) in the future.