feat: add REST API helpers

[danielroe]

✔️ Makes for very minimal API construction

❌ Downside is the slight increase in size: 0.3Kb

Happy for this to be closed. It's also trivial for an end-user to add this to the app instance.

[pi0]

Only downside is see with this is creating a wrapper function to filter out method. Also it wouldn't be easy for specify in nuxt config for example.

We would support it with layer.match() (and { method: 'get' / app.get }

[codecov-io]

Codecov Report

Merging #14 (1785cb5) into main (35408ce) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         6    +1     
  Lines          112       121    +9     
  Branches        29        30    +1     
=========================================
+ Hits           112       121    +9     

Impacted Files	Coverage Δ
src/helpers.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)

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[pi0]

Closing since PR is stalled. Also opened #18 to investigate method filtering.