UIHandler: extract binding strategy to support event delegation

[jiripudil]

My take on the opt-in event delegation as outlined in #400

cc @filiphlm

[codecov]

Codecov Report

Attention: Patch coverage is 88.79310% with 13 lines in your changes missing coverage. Please review.

Project coverage is 94.45%. Comparing base (6252f52) to head (ddba44d).

Files	Patch %	Lines
src/core/UIHandler.ts	88.79%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #410      +/-   ##
==========================================
- Coverage   94.71%   94.45%   -0.26%     
==========================================
  Files          11       11              
  Lines        1305     1389      +84     
  Branches      177      181       +4     
==========================================
+ Hits         1236     1312      +76     
- Misses         67       75       +8     
  Partials        2        2              

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