Shift operators are not parsed properly

[JHertz5]

Environment v3.27.0

Describe the bug The shift operators (e.g. sll) are parsed as parser.todo tokens, rather than the proper corresponding shift operator token.

To Reproduce Steps to reproduce the behavior:

1. Create a VHDL file called test.vhd, including the snippet

   A <= X sll Y;
   A <= X srl Y;
   A <= X sla Y;
   A <= X sra Y;
   A <= X rol Y;
   A <= X ror Y;

2. Run ./bin/vsg_parser -f test.vhd
3. Observe the output

   --------------------------------------------------------------------------------
   11 |   A <= X sll Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------
   12 |   A <= X srl Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------
   13 |   A <= X sla Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------
   14 |   A <= X sra Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------
   15 |   A <= X rol Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------
   16 |   A <= X ror Y;
   <class 'vsg.token.concurrent_simple_signal_assignment.target'>
   <class 'vsg.token.concurrent_simple_signal_assignment.assignment'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.parser.todo'>
   <class 'vsg.token.concurrent_simple_signal_assignment.semicolon'>
   --------------------------------------------------------------------------------

Expected behavior I expect these tokens to be parsed as the tokens in vsg/token/shift_operator.py

[JHertz5]

PR #1302 raised to address this issue.

[JHertz5]

This being completed facilitates new rules that act on shift operators, e.g. whitespace and capitalisation rules. I plan to raise issues and PRs for these in the near future.