[flutter_svg] add imageBuilder property to SvgPicture (#11615) related with flutter/flutter#182635 This PR exposes the `imageBuilder` support added to `VectorGraphic` in flutter/packages#11094 through `SvgPicture`. `SvgPicture` already supports `placeholderBuilder` and `errorBuilder`, but it did not provide a success-state builder. Without this API, callers have to wrap `SvgPicture` externally, which also wraps the placeholder and error states. Adding `imageBuilder` lets callers decorate or wrap only the successfully loaded SVG, while keeping loading and error UI separate. ## Alternatives considered - I chose `imageBuilder` because it follows the success-state wrapping pattern used by widgets like `CachedNetworkImage` ## Changes - Added `SvgImageWidgetBuilder`. - Added `imageBuilder` to all `SvgPicture` constructors. - Forwarded `imageBuilder` to `createCompatVectorGraphic`. - Added tests for successful load and placeholder states. - Bumped `flutter_svg` to 2.3.0 and `vector_graphics` to ^1.2.0. ## Pre-Review Checklist
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