fix(DOMMatrix/DOMPoint): align to spec

[ShaMan123]

DOMMatrix/DOMPoint were missing a few neglible methods as per the spec/d.ts files

This PR aligns to it.

Note that running npm run tsd throws:

  index.test-d.ts:7:0
  ✖  7:0  Parameter type { new (init?: string | number[] | undefined): DOMMatrix; prototype: DOMMatrix; fromFloat32Array(array32: Float32Array): DOMMatrix; fromFloat64Array(array64: Float64Array): DOMMatrix; fromMatrix(other?: DOMMatrixInit | undefined): DOMMatrix; } is not identical to argument type typeof DOMMatrix.  
  ✖  8:0  Parameter type DOMMatrix is not identical to argument type DOMMatrix.                                                                                                                                                                                                                                                  
  ✖  9:0  Parameter type { new (x?: number | undefined, y?: number | undefined, z?: number | undefined, w?: number | undefined): DOMPoint; prototype: DOMPoint; fromPoint(other?: DOMPointInit | undefined): DOMPoint; } is not identical to argument type typeof DOMPoint.                                                      

  3 errors

However running the following succeeds:

npx tsc ./index.test-d.ts --noEmit 

[ShaMan123]

Also I would like to suggest adding the following to the index.js file:

Object.assign(global, { DOMPoint, DOMMatrix })

This way projects using node-canvas and browser/offscreen native canvas with DOMPoint, DOMMatrix can be integrated seamlessly