Refactor package updater

[ainar-g]

Our testers reported that they cannot autoupdate from v0.105.0-beta.2 to v0.105.0-beta.3. Probably package updater issues. In the future, the package requires a thorough rewrite.

[ainar-g]

Okay, so we've pushed a patch for this in 9cd9054. But we still have a lot of users with bad updaters. As such the plan @ameshkov has proposed is the following:

1. We will temporarily be repacking our ZIP autoupdater archives for Darwin to have all files at the top level. This will not affect GitHub release page archives. Those will still contain the proper top-level directory.
2. That will go on at least until v0.106.0 release. The v0.105.0 release will contain the committed fix, and we assume that by the time v0.106.0 arrives most people will switch to a release from the v0.105 line.
3. The v0.106.0 release will drop the crutch.
4. (Preferably.) During the v0.106.0 cycle we'll rewrite the autoupdater code in AdGuard Home and properly cover it with tests.

@ameshkov, can you please make sure that I've described the plan correctly?

[ameshkov]

I think we can drop it once we release the first patch to v0.105