feat(partner): Introducing Partnership Fees

[shadrak98]

This will allow partners to pay for Partnership renewal Fee directly from FC To enable this a new Invoice type and Balance Transaction Type called as Partnership Fee has been introduced.

[codecov]

Codecov Report

Attention: Patch coverage is 19.14894% with 38 lines in your changes missing coverage. Please review.

Project coverage is 38.84%. Comparing base (d26510e) to head (ee56356).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
press/press/doctype/team/team.py	10.71%	25 Missing ⚠️
press/api/billing.py	14.28%	12 Missing ⚠️
...doctype/balance_transaction/balance_transaction.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2377      +/-   ##
==========================================
- Coverage   38.88%   38.84%   -0.04%     
==========================================
  Files         381      381              
  Lines       29396    29440      +44     
==========================================
+ Hits        11430    11436       +6     
- Misses      17966    18004      +38     

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