[New] Parse Ellipsis and None

[Thirumalai-Shaktivel]

Example:

def test() -> None:
    pass

Error:

$ lpython --show-ast --new-parser examples/expr2.py
syntax error: Token 'None' (of type 'none') is unexpected here
 --> examples/expr2.py:1:15
  |
1 | def test() -> None:
  |               ^^^^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).

Example 2:

def test():
    ...

Error:

$ lpython --show-ast --new-parser examples/expr2.py
syntax error: Token '...' is unexpected here
 --> examples/expr2.py:2:5
  |
2 |     ...
  |     ^^^ 


Note: if any of the above error or warning messages are not clear or are lacking
context please report it to us (we consider that a bug that needs to be fixed).