fix: Various multi-column bugs

[matthewlipski]

This PR fixes 4 bugs to do with multi-column blocks:

1. Dragging a block from one column to another in the same column list now works properly. Previously, it would copy the dragged block instead of moving it.
2. Fixed bug where creating a new column list above an existing one would merge them. This was due to incorrect positions being used in removeBlocksWithCallback.
3. Fixed bug where dropping a block inside a new column in a column list would sometimes throw an error, as nodeDOM would return null due to the cursor position being outdated. I've managed to reproduce this consistently using the document setup below, and dragging the "bbbbb" block between the "c" and "d" blocks.
4. Fixed error being thrown after live reload due to event listeners not getting cleaned up in the column resize extension.

Document to reproduce issue 3:

[
  {
    type: "columnList",
    children: [
      {
        type: "column",
        children: [
          {
            type: "paragraph",
            content: "a",
          },
        ],
      },
      {
        type: "column",
        children: [
          {
            type: "paragraph",
            content: "bbbbb",
          },
        ],
      },
    ],
  },
  {
    type: "columnList",
    children: [
      {
        type: "column",
        children: [
          {
            type: "paragraph",
            content: "c",
          },
        ],
      },
      {
        type: "column",
        children: [
          {
            type: "paragraph",
            content: "d",
          },
        ],
      },
    ],
  },
  {
    type: "paragraph",
  },
],

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
blocknote	✅ Ready (Inspect)	Visit Preview	Nov 14, 2024 0:40am
blocknote-website	✅ Ready (Inspect)	Visit Preview	Nov 14, 2024 0:40am

[tommerty]

Can I ask that if the resizing/dragging of columns be disabled if editable is false? 🙏🏻 #1244

[matthewlipski]

Can I ask that if the resizing/dragging of columns be disabled if editable is false? 🙏🏻 #1244

Will fix shortly! But in a separate PR