[explorer/rest] feat: Added beneficiary properties in block query

[AnthonyLaw]

Problem: missing beneficiary field in query.
Solution: added beneficiary and renamed total_fee

[Wayonb]

Can the param be initialized here instead of extend()?

[AnthonyLaw]

Yes, extend is not needed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.90%. Comparing base (c933172) to head (8698e29).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           explorer/nem-backend    #1927   +/-   ##
=====================================================
  Coverage                 96.90%   96.90%           
=====================================================
  Files                       267      267           
  Lines                     19321    19331   +10     
  Branches                    215      215           
=====================================================
+ Hits                      18723    18733   +10     
  Misses                      592      592           
  Partials                      6        6           

Flag	Coverage Δ
explorer-rest	99.53% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
explorer/rest/rest/db/NemDatabase.py	100.00% <100.00%> (ø)
explorer/rest/rest/model/Block.py	100.00% <100.00%> (ø)

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