feat: Open edX app theming capability improvements

[omerhabib26]

How we can update the theme:-

Steps to be followed:-

1. Create a resource directory that needs to be customized i.e., Fonts and Resources.
   • Path: core/src/{directory_name}/res/
   • Add only those resources that need to be customized i.e, logo, symbols or icons
   • Place the font.xml file in the src/{directory_name}/res/font directory, alongside the font files.
2. Update the resource path from core/build.gradle.

   sourceSets {
      {enviorment_name} {
           res.srcDirs = ['src/{directory_name}/res']
       }
   }
   

3. Update the Colors.kt according to the desired colors.

Pre-requisite:-

• We need to move colors codes from theme.kt to a separate Colors.kt as per material design recommendations. We can also follow the naming conventions suggested by the Material Design 3.
• We should specify fonts for the application rather than relying on the device's default fonts, and it's essential to update the font references in Type.kt.
  • It's advisable to include certain default fonts within the codebase.

PS: As we are going for new architecture we should migrate to Material.io 3.

[volodymyr-chekyrta]

Looks good to me 👍.
It's a draft. Should we merge or expect more in this PR?

[omerhabib26]

Looks good to me 👍. It's a draft. Should we merge or expect more in this PR?

we can merge it now. 🚀