Sympy parsing workaround for specific tokens

[mwdchang]

Summary

When rate-laws contain specific tokens sympy parsing tend to break as they are a part of reserved symbols. To parse them properly we encode them to something else, then revert them back when we need the parsing result.

So far, we have

• lambda
• S
• Ci

For example:

>>> parse_expr("A")
A
>>> parse_expr("A + 1")
A + 1
>>> parse_expr("S + 1")
ValueError: Error from parse_expr with transformed code: 'S +Integer (1 )'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/dchang/venv/3.11/lib/python3.11/site-packages/sympy/parsing/sympy_parser.py", line 1087, in parse_expr
    raise e from ValueError(f"Error from parse_expr with transformed code: {code!r}")
  File "/Users/dchang/venv/3.11/lib/python3.11/site-packages/sympy/parsing/sympy_parser.py", line 1078, in parse_expr
    rv = eval_expr(code, local_dict, global_dict)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dchang/venv/3.11/lib/python3.11/site-packages/sympy/parsing/sympy_parser.py", line 906, in eval_expr
    expr = eval(
           ^^^^^
  File "<string>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'SingletonRegistry' and 'One'

Testing

Import this model
pascale-strata-problem-templates.json

You should be able to view it, open up parameter matrices, open up template matrices without causing JS errors.

Alternatively you can mess around in the engineering interface (http://localhost:8080/pyodide-test) ... note there are JS errors here because it does partial evaluations as you type, but the output (eval, symbols...etc) should make sense.

Closes #5161
Closes #5185

[YohannParis]

LGTM

[blanchco]

seems to work well