Pycharm plugin publishing

[tamarinvs19]

Description

Added plugin.xml and other files for Pycharm plugin publishing to module utbot-intellij-python.

Now we can find this plugin after gradle action buildPlugin in directory utbot-intellij-python/build/distributions/. Github action publish-plugin-from-branch uses this file during publishing.

How to test

Manual tests

1. Run gradle action buildPlugin (or download from action https://github.com/UnitTestBot/UTBotJava/actions/runs/6826190541)
2. Try to install and use plugin in Pycharm from utbot-intellij-python/build/distributions/

Self-check list

Check off the item if the statement is true. Hint: [x] is a marked item.

Please do not delete the list or its items.

• [x] I've set the proper labels for my PR (at least, for category and component).
• [x] 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.
• [x] Manual tests have been provided optionally.
• [ ] The documentation for the functionality I've been working on is up-to-date.