Async trace compression

[KonradowyPL]

Fixes #100

• All previous compression functions were renamed to precompress accordingly.
• After precompressing, a task is added using the asyncio.create_task function (not loop.run_in_executor).
• This function compresses using level 22, then uploads to the database, overrides the previous database entry, and then deletes the previous file.
• If inserting the new file into the database fails, the new file is deleted so the old one remains.
• I have tested it regarding error handling, but it might not properly handle some edge cases.

Edit: I have no idea what causes segfault error in cython

[Zaczero]

Sent details on Discord, consider the bounty to be 15$ after the changes