feat(atproto): declare Leaflet compatibleFeatures

[nokome]

Populates the compatibleFeatures map in convert.ts with richtext features that are supported by both OXA and Leaflet thereby improving interoperability e.g.

      "features": [
        { "$type": "pub.oxa.richtext.facet#emphasis" },
        { "$type": "pub.leaflet.richtext.facet#italic" }
      ]

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[rowanc1]

@nokome this looks great!!