Please add a parameter to the "fitZoom" and "fitExtent" functions to control whether the calculation result is "cover" or "contain".

[IceSakuraAzure]

maptalks's version and what browser you use?
1.0.0-rc.33 Edge/122.0.2365.92

Issue description
I was using the "fitZoom" function and realized that it only makes the short side of the container fit the map, similar to the css "object-fit:contain" in css. But now I need to make the map fill the whole screen, like the "object-fit:cover" in css, so I want to add a parameter to control the result of this function.

Please provide a reproduction URL (on any jsfiddle like site)

[fuzhenn]

It makes sense, I will add a option for this.

We are migrating to typescript for now, will do this after the migration~