refactor(indexes): move interest scope to inside the index

[jansegre]

Acceptance Criteria

• replace hathor.indexes.manager._IndexFilter with hathor.indexes.base_index.Scope, making the indexes themselves report the scope of transactions they're interested in
• do not alter any behavior other than exposing the deps-indexes to partial transactions
• reduce rate of tests/tx/test_stratum.py failing because of running in parallel and listening on the same port

[codecov]

Codecov Report

Merging #538 (24038b9) into dev (42bfc1c) will increase coverage by 0.08%.
The diff coverage is 93.95%.

@@            Coverage Diff             @@
##              dev     #538      +/-   ##
==========================================
+ Coverage   83.11%   83.20%   +0.08%     
==========================================
  Files         209      211       +2     
  Lines       18512    18646     +134     
  Branches     2587     2590       +3     
==========================================
+ Hits        15386    15514     +128     
- Misses       2560     2562       +2     
- Partials      566      570       +4     

Impacted Files	Coverage Δ
hathor/builder.py	78.43% <ø> (+0.78%)	⬆️
hathor/manager.py	70.04% <ø> (-0.05%)	⬇️
hathor/transaction/storage/rocksdb_storage.py	92.70% <40.00%> (-2.04%)	⬇️
hathor/indexes/scope.py	75.67% <75.67%> (ø)
hathor/event/model/base_event.py	92.30% <92.30%> (ø)
hathor/indexes/manager.py	92.17% <96.87%> (-0.47%)	⬇️
hathor/event/__init__.py	100.00% <100.00%> (ø)
hathor/event/event_manager.py	97.01% <100.00%> (+2.07%)	⬆️
hathor/event/model/event_data.py	100.00% <100.00%> (ø)
hathor/event/resources/event.py	86.84% <100.00%> (+0.35%)	⬆️
... and 25 more

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