Update Starkode to read contract files from framework file structure

Currently starkode is not able to read contract files `.cairo`  from framework file structure.
Followings frameworks to be supported : 
1.   [Protostar](https://docs.swmansion.com/protostar/docs/cairo-1/project-initialization)
2.   [hardhat-starknet](https://book.starknet.io/chapter_3/hardhat.html)