[TM-3] Add commands to the executable

Description

Problem: for now, we have parser, which can be launched only from REPL and morley executable, that does nothing useful

Solution: use ArgParser library to parse command line args. Implement morley executable so it is possible to run parse with optional flag --expand-macros. Also add stubs for typecheck and run commands with corresponding flags. All commands has -h help flag, e.g. morley run -h

Related issue(s)

https://issues.serokell.io/issue/TM-3

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