Improve toHaveFocus

[mskelton]

Improves toHaveFocus to work with frames, element handles, and promise arguments.

[codecov-commenter]

Codecov Report

Merging #114 (f69f73a) into master (baf54f7) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
- Coverage   99.12%   99.09%   -0.03%     
==========================================
  Files          18       18              
  Lines         229      222       -7     
  Branches       25       20       -5     
==========================================
- Hits          227      220       -7     
  Misses          2        2              

Impacted Files	Coverage Δ
src/matchers/toHaveFocus/index.ts	100.00% <100.00%> (ø)

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