feat: add a ProvideOptions method for di initialization (solve #51)

[matdurand]

ProvideOptions is used to have a method receive dependencies and return other dependencies to be registered. This is useful to do conditional factories that return a variable number of dependencies.

Once I get confirmation that the code looks good, I will add the tests and doc.

Another option would be to simplify by not using a separate method, but by changing the Provide method to handle the special case of a constructor returning di.Option or []di.Option.

[codecov]

Codecov Report

Attention: 69 lines in your changes are missing coverage. Please review.

Comparison is base (0739076) 95.27% compared to head (60bd3bb) 88.41%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
container.go	0.00%	46 Missing and 1 partial ⚠️
factory.go	0.00%	13 Missing ⚠️
options.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   95.27%   88.41%   -6.87%     
==========================================
  Files          16       17       +1     
  Lines         889      958      +69     
==========================================
  Hits          847      847              
- Misses         30       98      +68     
- Partials       12       13       +1     

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