chore(@ice/app): exports internal router api

[linbudu599]

Exports router api for programmatic usage like Incremental router registry.

TODO: Is there additional input for router building?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (23811c8) 79.95% compared to head (7046679) 79.95%.

Additional details and impacted files

@@              Coverage Diff              @@
##           release/next    #6710   +/-   ##
=============================================
  Coverage         79.95%   79.95%           
=============================================
  Files               218      218           
  Lines             19001    19001           
  Branches           2452     2452           
=============================================
  Hits              15192    15192           
  Misses             3778     3778           
  Partials             31       31           

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