feat: Expose paint from svgComponent to set opacity and have opacity effects

[dipakp2726]

Description

currently you can't set opacity on svgComponent as its paint is private.
exposed paint from svgComponent Using HasPaint Mixin to so can get paint and set opacity and have opacity effects

usage

 final android = SvgComponent(
      svg: svgInstance,
      position: Vector2.all(100),
      size: Vector2.all(100),
    );

 android.paint.color =   android.paint.color.withOpacity(.6);

Checklist

• The title of my PR starts with a [Conventional Commit] prefix (fix:, feat:, docs: etc).
• I have followed the [Contributor Guide] when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• No, this PR is not a breaking change.

Related Issues

closes #2091 set opacity on SvgComponent

[ufrshubham]

I think a better idea would be to make SvgComponent use HasPaint so that it works with OpacityEffect as well.

[dipakp2726]

ok i will add it with HasPaint

[dipakp2726]

exposed paint With HasPaint mixin

[ufrshubham]

Since SvgComponent now has a paint, we can get rid of _paint from Svg

[dipakp2726]

took default value of paint from here