React: Add angle option in gradient color picker for waves.

[Anup Aglawe]

Right now the linear gradient has only 0 deg transform (which is default).

• Add input in the color picker modal to take angle as user input.
• Transform gradient according to the angle.
• gradientTransform should be the key to solve this

Ex-

    <linearGradient id="myGradient" gradientTransform="rotate(90)">
      <stop offset="5%"  stop-color="gold" />
      <stop offset="95%" stop-color="red" />
    </linearGradient>

[Taneli Riihimäki]

I could try to add this functionality 👍

[Anup Aglawe]

@TaneliR Yeah sure thanks. Assigning this to you. Feel free to ask questions if something isn't clear to you.