Modal tab trap

[Blackbaud-PatrickOFriel]

#860
#829
#772
#771
#635
#478

[Blackbaud-ToddRoberts]

Seems to behave properly according to the referenced issues

[codecov-io]

Codecov Report

Merging #911 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #911   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         301    301           
  Lines        5457   5531   +74     
  Branches      673    698   +25     
=====================================
+ Hits         5457   5531   +74

Impacted Files	Coverage Δ
src/modules/modal/modal-configuration.ts	100% <ø> (ø)	⬆️
src/modules/modal/modal-host.component.ts	100% <100%> (ø)	⬆️
src/modules/modal/modal-host.service.ts	100% <100%> (ø)	⬆️
...c/modules/modal/modal-component-adapter.service.ts	100% <100%> (ø)	⬆️
src/modules/modal/modal.component.ts	100% <100%> (ø)	⬆️
src/modules/modal/modal-adapter.service.ts	100% <100%> (ø)	⬆️

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