feat(tree-view)!: rename children prop to nodes for Svelte 5 compatibility

[metonym]

Fixes #2013

TreeView silently fails when using it with Svelte 5 because the children prop is reserved.

To fix this, rename the children prop to nodes. Additionally, rename the children property on nodes to nodes. This is to avoid confusion, but it's also necessary since TreeViewNodeList is a recursive component (i.e., passes props to svelte:self).

This is a breaking change but should be relatively straightforward to adapt to.

<TreeView
- children={[
+ nodes={[
    {
      nodes: [
        {
          id: 2,
          text: "IBM Analytics Engine",
-         children: [
+         nodes: [
            { id: 3, text: "Apache Spark" },
            { id: 4, text: "Hadoop" },
          ],
        },
      ],
    },
  ]}
/>

[metonym]

Released in v0.86.0