[Flock][Feature] - Add Texture Registry to Flutter Web

[jezell]

Flutter Issue Ticket Link:
flutter/flutter#119649

Why didn't Flutter implement this?
Lack of resources / prioritization. Originally was given P1, but then bumped to P2 where it remains.

Why does this belong in Flock?

Texture support is a core feature of all platforms except web.

Describe the solution you'd like

Expose a TextureRegistry hook similar to what is available on iOS / Android so that native textures can be utilized in Flutter Web.

CanvasKit already has the following hooks which may be useful as a starting point:

CanvasKit.Surface.prototype.makeImageFromTextureSource
CanvasKit.Surface.prototype.updateTextureFromSource