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test: add benchmark tests for UnmarshalUint and UnmarshalInt

These are the results from my local setup:
goos: linux
goarch: amd64
pkg: github.com/99designs/gqlgen/graphql
cpu: AMD Ryzen 7 7735HS with Radeon Graphics
BenchmarkUnmarshalIntInitial-16        62162     19745 ns/op
BenchmarkUnmarshalIntNew-16            53192     22884 ns/op
BenchmarkUnmarshalUintInitial-16       18339     67228 ns/op
BenchmarkUnmarshalUintNew-16           54229     22213 ns/op
PASS
ok  github.com/99designs/gqlgen/graphql6.208s

Signed-off-by: Rodney Osodo <socials@rodneyosodo.com>