feat: leverage lib `merge-graphql-schemas` allowing merge the same Ty…

[hank-cp]

…pes multiple times in different files.

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [x] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

Merging #21 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #21   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8      8           
  Lines         110    111    +1     
=====================================
+ Hits          110    111    +1

Impacted Files	Coverage Δ
lib/load_schema.js	100% <100%> (ø)	:arrow_up:

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