feat(variant): different transformer variants can be used

[rhwilr]

This PR will add the option to define multiple transform method in a Transformer class. These other transform methods are referred to as "variants".

• If no variant is defined, the default "transform" method will be used.
• A variant must be named as follows: transform{VariantName}
• A variant can be used by specifying it using the usingVariant method
• A variant can also be specified using dot-notation when passing the transformer as a string: App/Transformers/IDTransformer.variant1

[codecov]

Codecov Report

Merging #32 into next will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##           next    #32   +/-   ##
===================================
  Coverage   100%   100%           
===================================
  Files        37     38    +1     
  Lines       951   1020   +69     
===================================
+ Hits        951   1020   +69

Impacted Files	Coverage Δ
src/Bumblebee/Scope.js	100% <100%> (ø)	⬆️
src/Bumblebee/index.js	100% <100%> (ø)	⬆️
src/Bumblebee/Resources/ResourceAbstract.js	100% <100%> (ø)	⬆️
test/transformer.spec.js	100% <100%> (ø)	⬆️
test/transformer-variants.spec.js	100% <100%> (ø)
src/Bumblebee/Manager.js	100% <100%> (ø)	⬆️
src/Bumblebee/TransformerAbstract.js	100% <100%> (ø)	⬆️

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[rhwilr]

@RomainLanz I have a working PoC and would love to get your feedback on it.
I really like the way we can set the variant using the same as with controllers in routes.

Maybe you can take a quick look at the test to see if you like the API transformer-variants.spec.js?

Also, I have been looking through the Adonis source code to see how Adonis does the Controller/Method resolution and how the default namespace gets prepended to controllers. But I could not find it. Maybe you can point me in the right direction?

[RomainLanz]

Nice! I'll give it a shot in this project https://github.com/Lausanne-eSports/api.els.team

[RomainLanz]

I believe you can merge it and release it as a new beta. 👍

[rhwilr]

Will do! Probably tomorrow, maybe even later this evening.
Thanks for checking it out! 😃