Introduce utbot-spring-analyzer module

[tepa46]

Description

utbot-spring-analyzer is a new module in UtBot required to generate tests for Spring applications.

This module will be called from UtBot in a separate process. For test and debug goals it may be run separately.

The base action chain of this module is the following:

• obtains configuration classes from user application
• creates a custom Spring application that uses the obtained config
• gets all required information for analysis in UtBot (e.g. bean definitions)
• stores this information (currently to a text file)
• stops Spring before context initialization (currently deletes all bean definitions)

How to test

Manual tests

Prepare command line arguments:

• arg0: classpath to projects under test
• arg1: fully qualified name of configuration class

Verify that SpringBeans.txt file is generated and some bean class names are present there.

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.

[EgorkaKulikov]

Seems to be good enough for the first implementation to be merged. Improvement process will be continued.
Also we need to implement a runner for this functionality in another process for UtBot, would like to start this integration.
Functionality is harmless for UtBot and currently cannot be called from it.