feat: Add fees endpoint for Node class

[Highjhacker]

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build (changes that affect the build system)
• Docs (documentation only changes)
• Test (adding missing tests or fixing existing tests)
• Other... Please describe:

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[codecov-io]

Codecov Report

Merging #31 into master will decrease coverage by 0.23%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   97.61%   97.38%   -0.24%     
==========================================
  Files          19       19              
  Lines         839      841       +2     
==========================================
  Hits          819      819              
- Misses         20       22       +2

Impacted Files	Coverage Δ
Client/Client/Api/Endpoints/Node.swift	84.61% <0%> (-15.39%)	⬇️

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