fix: correctly expose route and middleware types

[danielroe]

• allows arrays of routes/handlers to be passed in (types)
• this exposes Middleware (Handler with next()) rather than just Handler if promisify has not been set to false (types)

[codecov-io]

Codecov Report

Merging #10 (3b89ac7) into main (091481d) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          112       112           
  Branches        29        29           
=========================================
  Hits           112       112           

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