Add @Extensions decorator

[hihuz]

Hello 👋

First of all, thank you very much for your work on this library, it has helped us a lot in rapidly creating a graphql endpoint to go hand in hand with our existing REST API 🙂

In this PR, I will attempt to address this issue: #124

I have tried to base my implementation off of the comments I could read in the issue and also in the PRs that were previously created for this. I also took inspiration from the Directive PR (#369) which helped me by showcasing recent good PR practices on the project.

I will leave several comments of my own where I am unsure about my approach, I would be grateful if you could let me know your views on them, and also for any time you would spend reviewing the PR.

I won't be very active during the upcoming week-end, but I'll definitely try to address any feedback as fast as I can during the next week.

Best!

[codecov]

Codecov Report

Merging #521 into master will decrease coverage by 0.25%.
The diff coverage is 96.42%.

@@            Coverage Diff             @@
##           master     #521      +/-   ##
==========================================
- Coverage   95.18%   94.93%   -0.26%     
==========================================
  Files          76       77       +1     
  Lines        1330     1361      +31     
  Branches      257      264       +7     
==========================================
+ Hits         1266     1292      +26     
- Misses         61       66       +5     
  Partials        3        3

Impacted Files	Coverage Δ
src/schema/schema-generator.ts	96.74% <ø> (ø)	⬆️
src/metadata/utils.ts	90% <ø> (-4.12%)	⬇️
src/metadata/metadata-storage.ts	100% <100%> (ø)	⬆️
src/decorators/index.ts	100% <100%> (ø)	⬆️
src/decorators/Extensions.ts	88.88% <88.88%> (ø)
src/helpers/isThrowing.ts	20% <0%> (-60%)	⬇️

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[MichalLytek]

@hihuz

[hihuz]

@MichalLytek Hmm my mistake 🙁I did enable this option but it seems our organization rules override it, I have added an invitation on the repo for you, it should enable you to push changes if you accept it

If it does not, I will fork again on my personal account, sorry for the inconvenience.

[MichalLytek]

TypeError: Cannot read property 'log' of undefined",
  at LoggerMiddleware.use 

@hihuz I think you've forgot to setup container in buildSchema and haven't run the example 😄

[MichalLytek]

Now everything looks great! 🎉

Thank you very much for the contribution ❤️

[hihuz]

@MichalLytek Thank you very much for all the time you spent looking at the PR and for all the feedback, much appreciated 🙂

Apologies for the remaining issue with the examples 🤦‍♂ and thank you for fixing it 👍