add type to RouteParameterResolverContext

[fergusean]

Summary of changes

Provides resolvers with type information. As an example case, this enables a resolver to determine optionality in order to understand if they should throw vs return undefined in the event they're unable to resolve a value.

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[codecov-commenter]

Codecov Report

Merging #341 (642d05f) into master (a6f881d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #341   +/-   ##
=======================================
  Coverage   78.35%   78.35%           
=======================================
  Files         169      169           
  Lines       17723    17723           
  Branches     4629     4629           
=======================================
  Hits        13887    13887           
  Misses       3836     3836           

Impacted Files	Coverage Δ
packages/http/src/router.ts	90.11% <ø> (ø)

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[fergusean]

@marcj what's the process for getting this merged?

[marcj]

@fergusean thanks! merged