Bug 2491: feat: Update URL extraction to preserve case sensitivity

[prathik2401]

Bug 2491, which stated that the URLs were being converted to lowercase, which potentially caused issues for URLs with uppercase characters.

Describe the Pull Request

All the URLs in Static Analysis were being forced to lowercase characters, which fails in real-world, because URLs are case sensitive, and only domains are case insensitive.

Checklist for PR

• Run MobSF unit tests and lint tox -e lint,test
• Tested Working on Linux, Mac, Windows, and Docker
• Add unit test for any new Web API (Refer: StaticAnalyzer/tests.py)
• Make sure tests are passing on your PR

Additional Comments (if any)

I have tested this on couple of applications which have lowercase, uppercase, and mixture of both these. And now we are able to capture the case of the url too.