chore: use own implementation for file extraction

[lynxtaa]

[codecov-io]

Codecov Report

Merging #64 (056d554) into master (09677b9) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #64   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         9    +1     
  Lines           89       126   +37     
  Branches        22        31    +9     
=========================================
+ Hits            89       126   +37     

Impacted Files	Coverage Δ
src/AwesomeGraphQLClient.ts	100.00% <100.00%> (ø)
src/util/extractFiles.ts	100.00% <100.00%> (ø)
src/util/gql.ts	100.00% <100.00%> (ø)
src/util/isFileUpload.ts	100.00% <100.00%> (ø)

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