refactor(p2p): Build ConnectionsManager in builder

[msbrogli]

Acceptance criteria

1. Build ConnectionsManager in builders.
2. Move ssl: bool, enable_sync_v1, enable_sync_v1_1, and enable_sync_v2 to ConnectionsManager.
3. Remove HathorManager.server_factory and HathorManager.client_factory.

Note

There are still some network-related attributes and methods on HathorManager. I'll move those on a separate refactor to keep this one small for reviewers. Some attributes and methods yet-to-be moved out of HathorManager are:

• listen_addresses: List[str]
• capabilities
• has_sync_version_capability()
• add_peer_to_whitelist()
• remove_peer_from_whitelist_and_disconnect()
• listen()
• do_discovery()

[codecov]

Codecov Report

Merging #622 (6d1fe41) into master (c5c827e) will decrease coverage by 0.12%.
The diff coverage is 93.10%.

❗ Current head 6d1fe41 differs from pull request most recent head f822d88. Consider uploading reports for the commit f822d88 to get more accurate results

@@            Coverage Diff             @@
##           master     #622      +/-   ##
==========================================
- Coverage   83.74%   83.63%   -0.12%     
==========================================
  Files         236      232       -4     
  Lines       19949    19857      -92     
  Branches     2727     2712      -15     
==========================================
- Hits        16707    16608      -99     
- Misses       2643     2650       +7     
  Partials      599      599              

Impacted Files	Coverage Δ
hathor/builder/builder.py	89.75% <80.76%> (-1.37%)	⬇️
hathor/p2p/manager.py	72.51% <95.83%> (+2.14%)	⬆️
hathor/builder/cli_builder.py	71.05% <100.00%> (+0.78%)	⬆️
hathor/manager.py	70.08% <100.00%> (-0.52%)	⬇️
hathor/p2p/factory.py	100.00% <100.00%> (ø)
hathor/p2p/protocol.py	92.98% <100.00%> (-0.06%)	⬇️
hathor/p2p/sync_v1_1_factory.py	100.00% <100.00%> (ø)
hathor/p2p/sync_v1_factory.py	100.00% <100.00%> (ø)
hathor/simulator/fake_connection.py	82.73% <100.00%> (ø)

... and 16 files with indirect coverage changes