Missing implementation of reset method on CanvasRenderingContext2D and OffscreenCanvasRenderingContext2d

[Nul-led]

Describe the Bug

CanvasState.reset is not implemented for web_sys::CanvasRenderingContext2d and web_sys::OffscreenCanvasRenderingContext2d.

Steps to Reproduce

None

Expected Behavior

web_sys::CanvasRenderingContext2d::reset and web_sys::OffscreenCanvasRenderingContext2d::reset should exist as per specification.

Actual Behavior

The method mentioned above is not implemented.

Additional Context

None

[daxpedda]

Happy to review a PR!

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