title: Disable tooltip labels being truncated/increasing tooltip character limit when using vega-lite
body: <p>Im creating a visualization in kibana using vega-lite, but I suppose this applies anywhere. Is there a way in vega-lite to disable, or at least increase the character length of the tooltip so that it is not truncated? I can't find any documentation or links about this. Thanks.
  The following is a rough example. I'd like the tooltip to show the full length of 'aaaaabbbcccc' instead of it being automatically truncated to 'aaabbbc...'</p>
  
  <pre><code>{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
      "values": [
        {"a": "AAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCC", "b": 28},
        {"a": "B", "b": 55},
        {"a": "C", "b": 43},
        {"a": "D", "b": 91},
        {"a": "E", "b": 81},
        {"a": "F", "b": 53},
        {"a": "G", "b": 19},
        {"a": "H", "b": 87},
        {"a": "I", "b": 52}
      ]
    },
    "mark": "bar",
    "encoding": {
      "x": {"field": "a", "type": "ordinal"},
      "y": {"field": "b", "type": "quantitative"},
      "tooltip": [
        {"field": "a", "type": "ordinal"},
        {"field": "b", "type": "quantitative"}
      ]
    },
     "config": {
      "view": {"stroke": "transparent"},
      "axis": {
        "labelColor": "#98A2B3",
        "grid": false,
        "labelLimit": 100
      }
    }
  }
  </code></pre>
  
  <p><a href="https://vega.github.io/editor/#/url/vega-lite/N4KABGBEAkDODGALApgWwIaQFxUQFzwAdYsB6UgN2QHN0A6agSz0QFcAjOxge1IRQyUa6ALQAbZskoAWOgCtY3AHaQANOCgATdHkw5QECJAroxrZLGxgA2hsNhgkPVACCb9x89eAQr7-+A3wBhENCw8LUodisAJgAOAF91ewhHZ0hvSMhonABWXKS7QzSrSCCsnLBpAGZClIcnUoARCqsATgBGOpSSnEgAUVacOK7knsa+gDEhsFzasfteqABxGY627sWJqAAJGbiAdk3i7cgASRncmISigF0NbsgMACcAa1L2dGe1DUhkJXg3E0jCU1CsBkMkAAHuDIAAzRjIMSaUqYVRQPAAT0IyFK3GewKUpkgx0gmNhCKRKL60XRkCxONKAEdWOglHhmDpGFQSQsMdxuGIOYQrLZ6o5KcjUVkGbi+vjCcTjql4YipTSZdi5VAWWyOboOTybvZ7hBNpBAUoEWD9EVjIiAO6w2B4Z7cV7a+nPNmwQhff54Xl29BQxiWW31SBidDsJFBQX40oAYjacRcMW81R+keoz0Y1LAcNMsGQfKM0djYgAMoxUMwrB0AAyNorGsA3BJAA" rel="noreferrer">Online editor</a></p>