Add MarkerIcon type

[darron1217]

to fix #1622

[darron1217]

I suggest changing iconUrl into icon, but I didn't applied it on my PR. (Cuz it's breaking change)

[ghost]

Thanks, here are a few improvements

[ghost]

why are all of these typed any | Something?

[darron1217]

That's because interface props without ? causes compile error.
For example, Size interface checks every prop exists even if I just want to use width & height

export interface Size {
    height: number;
    width: number;
    equals(other: Size): boolean;
    toString(): string;
}

I wanted to add question mark on every props of Size, but I just picked other solution.

[ghost]

because Size is a class, not a literal interface. Google Maps API doesn't just support {width: 100, height: 200} . You're supposed to use their provided class with constructor. https://developers.google.com/maps/documentation/javascript/reference/coordinates#Size

[darron1217]

Got it, I was using it in a wrong way

[ghost]

Marker#setIcon should also allow Icon and GoogleSymbol

[darron1217]

You've got a keen eye :)

[codecov]

Codecov Report

Merging #1836 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1836   +/-   ##
=======================================
  Coverage   47.97%   47.97%           
=======================================
  Files          47       47           
  Lines        1999     1999           
  Branches      177      177           
=======================================
  Hits          959      959           
  Misses       1036     1036           
  Partials        4        4           

Impacted Files	Coverage Δ
packages/core/map-types.ts	0.00% <ø> (ø)
packages/core/services/google-maps-types.ts	100.00% <ø> (ø)
packages/core/directives/marker.ts	37.06% <100.00%> (ø)

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