feat(convertShapeToPath): convert rect with rounded corners using arcs

[JoCa96]

Convert rect shape with a defined rx and/or ry to path when the convertArcs parameter is true.

E.g.

<rect x="40" y="50" width="30" height="20" rx="2" ry="5"/>

will become

<path d="M68 50A2 5 0 0 1 70 55L70 65A2 5 0 0 1 68 70L42 70A2 5 0 0 1 40 65L40 55A2 5 0 0 1 42 50z"/>

When rx and ry are invalid or 0 the conversion will be performed without arcs as there are no rounded corners in that case.

[KTibow]

why would you want to do this? this seems like the opposite of optimization

[JoCa96]

why would you want to do this? this seems like the opposite of optimization

That's true for all conversions that are enabled by the convertArcs flag.

The need for this is use-case dependant.
If the flag is enabled it should do all the arc conversions imho. We want to reduce all shapes to a single path. You can also see the need for this in PR #1767.

[jguddas]

This is basically the opposite of #1748, there are definitely cases where one is closer than the other.