Add JavaDoc comment style setting #774

[onewhl]

Description

Add JavaDoc comment style setting to the Settings window to provide users a possibility to choose comment style.

Fixes #774

TODO: Need to discuss naming with @olganaumenko.

Type of Change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Manual Scenario

Run plugin, open the UTBot's Settings window (File -> Settings -> UTBot), click at the drop-down list JavaDoc comment style, choose any value and run test generation. Check if the comments match the selected style.

Checklist (remove irrelevant options):

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• New documentation is provided or existed one is altered
• No new warnings
• New tests have been added
• All tests pass locally with my changes

[amandelpie]

Could be merged