[11.x] Support New Lines in Command Argument and Option Descriptions

[shamimulalam]

This PR introduces support for new lines in argument and option descriptions within the {} template in the parse() method. Previously, new lines were escaped, but this change allows for easier formatting of long descriptions, which improves readability.

The main benefit of this change is improved readability, making it easier to break up long descriptions without affecting the current functionality.

A test has been added to ensure the parse() method correctly handles new lines in descriptions. The test verifies that everything works as expected without introducing any regressions.

In summary, this PR makes command signature descriptions more readable and ensures the code is safer without causing any breakage.

[taylorotwell]

Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!