openscenario_parse.py don't supports parameter which is scientific notation (for example, 1.234+e+01)

[fukuchi0105]

Describe the bug
In "openscenario_parse.py", "is_literal function" don't support scientific notation (for example, 1.234+e+01). Therefore, when parsing OpenSCENARIO file which include scientific notations parameter, it cannot parse it.

current parser of regular expression: r"(-)?\d+(.\d)?"
proposed parser of regular expression: r"(-)?\d+(.\d)?((e|E)(+|-)\d+)?"

To Reproduce
Steps to reproduce the behavior:

1. make OpenSCENARIO file which include scientific notations
2. run scnario_runner by using above OpenSCENARIO file

Expected behavior
Be able to run scenario by using OpenSCENARIO file including scientific notations

Desktop (please complete the following information):

• OS: Windows 10
• CARLA 0.9.13
• Python version 3.9
• Version 0.9.13

[golnazraja]

I also faced the same issue and fixed it with adding support of parsing parameters with scientific notation.

Here is link to my pull request: #1023