Implement bool.real, bool.imag bool.conjugate()

[corona10]

There are some attributes that should be implemented for gpython.

Expected

>>> a = True
>>> a.imag
0
>>> a.real
1
>>> a.conjugate()
1

Actual

>>> a = True
>>> a.image
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
AttributeError: "'bool' has no attribute 'image'"
>>> a.real
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
AttributeError: "'bool' has no attribute 'real'"
>>> a.conjugate()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
AttributeError: "'bool' has no attribute 'conjugate'"

[corona10]

@ncw I am going to assign this issue to the contributhon 2019 participants

[parkchansoo]

I want to take a look at this issue 🙌

[corona10]

@parkchansoo
Please go ahead.
Here is a similar code you have to look at.

gpython/py/complex.go

Line 300 in 7bc4005

ComplexType.Dict["real"] = &Property{