Modified the case of autolev parser

[aquazod]

Fixes #15166 & #16580

Brief description of what is fixed or changed

• Added the parameter lower_case to the parse_autolev() function in the files: __init__.py, _parse_autolev_antlr.py, and test_autolev.py.
• Removed the .lower() function from the _listener_autolev_antlr.py file as much as I could. Some .lower() functions had to stay there because they were either a key or a value in dictionaries.

Other comments

Can someone guide me to how to run the tests please

Release Notes

• functions
  • added lower_case paramter to parse_autolev()

Thanks @NikhilPappu for the given tips previously.

[sympy-bot]

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• functions
  • added lower_case paramter to parse_autolev() (#26441 by @aquazod)

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<!-- Your title above should be a short description of what
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Fixes [#15166](https://github.com/sympy/sympy/issues/15166) & [#16580 ](https://github.com/sympy/sympy/pull/16580)
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#### Brief description of what is fixed or changed

- Added the parameter `lower_case` to the `parse_autolev()` function in the files: `__init__.py`, `_parse_autolev_antlr.py`, and `test_autolev.py`.
- Removed the .lower() function from the `_listener_autolev_antlr.py` file as much as I could. Some `.lower()` functions had to stay there because they were either a key or a value in dictionaries. 

#### Other comments
Can someone guide me to how to run the tests please

#### Release Notes

<!-- BEGIN RELEASE NOTES -->
* functions
     * added `lower_case` paramter to `parse_autolev()`
<!-- END RELEASE NOTES -->
Thanks @NikhilPappu for the given tips previously.
<!-- Write the release notes for this release below between the BEGIN and END
statements. The basic format is a bulleted list with the name of the subpackage
and the release note for this PR. For example: