Update build process

[sameeul]

• Updated build process to create libfilepattern
• Updated Python package build process. Now, it will check if the C++ package is already installed or not. If installed, it will use that otherwise it will build the C++ library and then link backend against it.

These change will now allow us to have separate c++ and python conda recipe from the same repo.

[sweep-ai]

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• Apply: Leftover TODOs in the code should be handled.
• Apply: All new business logic should have corresponding unit tests in the tests/ directory.
• Apply: Any clearly inefficient or repeated code should be optimized or refactored.