Provide more typings for application's context and request/response

[mihailik]

Few extra JSDoc decorations that convey types so end-users of the library get better experience:

Similar to #1607 and the suggestion by @jaydenseric except no project changes, just tweaking JSDoc 👍

[mihailik]

Sorry missed space

[codecov]

Codecov Report

Base: 99.61% // Head: 99.61% // No change to project coverage 👍

Coverage data is based on head (33a4dc9) compared to base (9d2afef).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1726   +/-   ##
=======================================
  Coverage   99.61%   99.61%           
=======================================
  Files           5        5           
  Lines         521      521           
  Branches      145      145           
=======================================
  Hits          519      519           
  Misses          2        2           

Impacted Files	Coverage Δ
lib/application.js	98.43% <ø> (ø)

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