Implement other Tests for the compiler

[Adityarya11]

Currently only two test are supported for the compiler, InterpreterBooleanIntegrationTests.cc and LexerIntegrationTests.cc

We need to implement other tests which are

• evaluator_integration.rs and
• parser_integration.rs

the tests that are needed to implement are inspired from the Zen language from which the whole idea of the compiler exist.