Feature/end to end synctest

[asdacap]

• End to end sync tests.
  • Create a fullish nethermind server and client, connect them two and sync.
  • This is done in combination of (archive, hash, halpath) X (pre merge, post merge) X (full, fast, snap).
• Cover as much as reasonable except for actualy IO and peer discovery, which includes block processing/production and snap/hash server and rlp encoding.
• Replaces SyncThreadsTests.
• Some bugfix will be spawn out to separate PR.

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

Notes on testing

• Well.. it passed.

[kamilchodola]

@asdacap But we have sth like this (not in neth code but reproducing the result from here) - will send details on Slack

[asdacap]

This is much smaller and not on a real network. Also, run on every PR.