Update python unit test generation

[tamarinvs19]

Description

It is a new version of Python UTBot.

Updates:

• Now we use only new fuzzing platform
• New python object serialization and deserialization strategy
• New type inference algorithm
• Remove python3parser (it was the biggest dependency)
• Simple state after / state before asserts

How to test

Manual tests

We have some examples in /utbot-python/samples directory.

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.

[Markoutte]

At the moment it throws an exception for a method that isn't declared with class:

def test(self, x):
    if (x < 0):
        return -1
    return x*x

print(test(2))

When trying to generate for method test it throws:

java.lang.NullPointerException
	at org.utbot.python.PythonTestCaseGenerator.findMethodByDescription(PythonTestCaseGenerator.kt:54)
	at org.utbot.python.PythonTestCaseGenerator.generate(PythonTestCaseGenerator.kt:98)
	at org.utbot.python.PythonTestGenerationProcessor.processTestGeneration(PythonTestGenerationProcessor.kt:109)
	at org.utbot.python.PythonTestGenerationProcessor.processTestGeneration$default(PythonTestGenerationProcessor.kt:32)
	at org.utbot.intellij.plugin.language.python.PythonDialogProcessor$createTests$1.run(PythonDialogProcessor.kt:161)

[Markoutte]

Please, update branch to make it compilable with changes in JS module

[Markoutte]

Looks like we can drop lines before this to unify build.gradle with other project's modules.

[tamarinvs19]

Fixed