Enable Users to see Code Coverage on expaned code

We should allow users to run coverage on expanded code, especially to see coverage for macros that might contain conditional statements and thus can be not fully covered. We can approach this in three ways, ranked from the easiest to the most complicated:

Proposed Solutions:

1. Ask users to run scarb expand on their own and input it to Cairo coverage

   • Changes Required: Only in Scarb
   • Description: Users will manually run scarb expand and then input the expanded code into Cairo coverage tool.

2. Add --expand flag to Forge

   • Changes Required: In Scarb and Forge
   • Description: Forge will run scarb expand behind the scenes and then pass the output to Cairo-coverage. This process will be automated for the user.

3. Change mappings in the compiler to also point to expanded lines

   • Changes Required: Needs more investigation
   • Description: Needs more investigation

Additional Requirements:

• Inline Macro Expansion: Currently, Scarb does not expand inline macros. We need to implement this capability (Reference: Language Server Implementation).

Start by comparing the three proposed approaches across Scarb, Forge, and Cairo coverage. Read the referenced cairo-lang-language-server/src/ide/macros/expand.rs implementation, then investigate how Scarb handles inline macro expansion. Done means selecting and implementing a concrete approach that lets coverage report expanded code, including conditional macro branches.