[lightapi/python] feat: added total fee and beneficiary properties

[AnthonyLaw]

Problem: I noticed that the block info included beneficiary and totalFee properties, but they are not mentioned in the NEM docs.
Solution: Added beneficiary and totalFee, which makes it possible to calculate harvested fees directly instead of calculating from the transactions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.87%. Comparing base (c187157) to head (df897c1).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1901      +/-   ##
==========================================
+ Coverage   96.14%   96.87%   +0.73%     
==========================================
  Files         343      261      -82     
  Lines       23803    19118    -4685     
  Branches      402      215     -187     
==========================================
- Hits        22885    18521    -4364     
+ Misses        905      591     -314     
+ Partials       13        6       -7     

Flag	Coverage Δ
explorer-rest	?
lightapi-python	98.67% <100.00%> (+<0.01%)	⬆️
wallet-mobile-symbol	?

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

Files with missing lines	Coverage Δ
...pi/python/symbollightapi/connector/NemConnector.py	100.00% <ø> (ø)
lightapi/python/symbollightapi/model/Block.py	100.00% <100.00%> (ø)

... and 82 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Wayonb]

👍🏾