refactor: move get settings [part 3]

[glevco]

Depends on #768

Motivation

Please read the description on #768, this PR is just a follow-up part.

Acceptance Criteria

• Remove some usages of HathorSettings() from the module level and move it to inside functions/methods
  • For functions, the function just calls the new get_settings()
  • For classes we set self._settings = get_settings() in the class' __init__(), and update all methods to use that new attribute

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Patch coverage: 92.46% and project coverage change: -0.07% ⚠️

Comparison is base (dbeaa9e) 84.75% compared to head (57e3d00) 84.69%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #770      +/-   ##
==========================================
- Coverage   84.75%   84.69%   -0.07%     
==========================================
  Files         259      259              
  Lines       21933    21939       +6     
  Branches     2964     2964              
==========================================
- Hits        18590    18581       -9     
- Misses       2700     2709       +9     
- Partials      643      649       +6     

Files Changed	Coverage Δ
hathor/consensus/context.py	100.00% <ø> (ø)
hathor/indexes/rocksdb_height_index.py	94.11% <ø> (-0.12%)	⬇️
hathor/merged_mining/coordinator.py	34.02% <ø> (-0.19%)	⬇️
hathor/mining/ws.py	50.00% <ø> (-0.71%)	⬇️
hathor/transaction/storage/tx_allow_scope.py	92.85% <ø> (-0.48%)	⬇️
hathor/wallet/resources/thin_wallet/send_tokens.py	68.51% <40.00%> (ø)
hathor/consensus/block_consensus.py	94.36% <57.14%> (ø)
hathor/graphviz.py	77.02% <66.66%> (ø)
hathor/transaction/resources/utxo_search.py	82.69% <66.66%> (ø)
hathor/p2p/states/hello.py	72.27% <80.00%> (+0.27%)	⬆️
... and 30 more

... and 4 files with indirect coverage changes

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The base branch was changed.