add NWC get_budget method support

[frnandu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes missing coverage. Please review.

Project coverage is 72.18%. Comparing base (e8c0a11) to head (87c197d).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...er/usecases/nwc/responses/get_budget_response.dart	0.00%	13 Missing ⚠️
...yer/usecases/nwc/consts/budget_renewal_period.dart	0.00%	4 Missing ⚠️
...ackages/ndk/lib/domain_layer/usecases/nwc/nwc.dart	0.00%	4 Missing ⚠️
...domain_layer/usecases/nwc/requests/get_budget.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
- Coverage   72.87%   72.18%   -0.70%     
==========================================
  Files         106      109       +3     
  Lines        3550     3573      +23     
==========================================
- Hits         2587     2579       -8     
- Misses        963      994      +31     

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