Proposal of another API for handling ExceptionGroup

[bob1de]

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This is related to python-trio/trio#1683.

Just a POC for how the API could look with ExceptionGroup.

[codecov[bot]]

Codecov Report

Merging #22 into master will increase coverage by 6.74%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   66.55%   73.30%   +6.74%     
==========================================
  Files          11       11              
  Lines         311      427     +116     
  Branches       28       39      +11     
==========================================
+ Hits          207      313     +106     
- Misses        101      111      +10     
  Partials        3        3              

Impacted Files	Coverage Δ
exceptiongroup/_tools.py	56.06% <ø> (ø)
exceptiongroup/__init__.py	85.71% <79.16%> (-14.29%)	:arrow_down:
exceptiongroup/_tests/test_exceptiongroup.py	100.00% <100.00%> (ø)