feat(dialog): Add generic parameter for dialog result

[trimox]

Adds the R generic parameter to MdcDialog open method; allows for the dialog result to be strongly typed.

[codecov]

Codecov Report

Merging #2074 into master will decrease coverage by 0.12%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2074      +/-   ##
==========================================
- Coverage   90.42%   90.29%   -0.13%     
==========================================
  Files         100      100              
  Lines        4364     4275      -89     
  Branches      568      551      -17     
==========================================
- Hits         3946     3860      -86     
+ Misses        208      206       -2     
+ Partials      210      209       -1

Impacted Files	Coverage Δ
packages/chips/module.ts	100% <ø> (ø)	⬆️
packages/chips/chip-directives.ts	100% <100%> (ø)	⬆️
packages/chips/chip.ts	85.88% <100%> (-3.67%)	⬇️
packages/dialog/dialog.component.ts	85.33% <0%> (ø)	⬆️

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