add graphql endpoint

[dsychin]

Added graphql schema generator and API server endpoint. I have left the folder structure as default.

General workflow for developing with the gqlgen tool is as follow.

1. Make changes in pkg/graph/schema.graphqls.
2. Run make generate in repo root.
3. It should update the pkg/graph/schema.resolvers.go file.
4. If you deleted anything in step 1, it will probably throw an error, so go into pkg/graph/schema.resolvers.go and find the code to be deleted at the bottom, check that they are no longer required and deleted them. Then run make generate again.
5. Edit pkg/graph/schema.resolvers.go to add the database code or business logic.

[codecov-commenter]

Codecov Report

Merging #36 (f7d071c) into main (03e11a9) will decrease coverage by 81.66%. The diff coverage is 14.61%.

@@             Coverage Diff              @@
##              main      #36       +/-   ##
============================================
- Coverage   100.00%   18.33%   -81.67%     
============================================
  Files            1        5        +4     
  Lines            9      180      +171     
============================================
+ Hits             9       33       +24     
- Misses           0      138      +138     
- Partials         0        9        +9     

Impacted Files	Coverage Δ
pkg/scraper/bruneida_scraper.go	6.34% <6.34%> (ø)
pkg/controller/controller.go	42.85% <7.69%> (-57.15%)	:arrow_down:
pkg/scraper/jobcenter_scraper.go	8.00% <8.16%> (ø)
pkg/scraper/scraper.go	24.24% <24.24%> (ø)
pkg/graph/schema.resolvers.go	61.53% <61.53%> (ø)

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