Add <field> and <function> completions in xml interfaces#1748
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Provide IntelliSense in .xml component files, driven by the built-in roku-types node metadata and project components. - Program: getSceneGraphNodeNames/getSceneGraphNodeFields (resolves the extends chain across built-in nodes and project components), hasSceneGraphNode, getSceneGraphNode - XmlFile.getCompletions: element (tag name) completions after `<` and in element content, and field (attribute) completions inside a start tag; adds getTokenAt for token-at-position lookups - LanguageServer: add `<` as a completion trigger character - SGParser: skip malformed child elements with no tag name instead of throwing (a lone `<` while typing) - roku-types: add `extends` to SGNodeData
Node and component element completions were appearing everywhere in element content (the component root, inside <interface>, etc.). Gate them on the enclosing element so they only appear inside a <children> block or nested inside another node; other locations now yield no node completions.
Inside an <interface> block, offer <field> and <function> element completions, and inside a <field>/<function> start tag offer their attributes (id, type, value, onChange, alwaysNotify, alias / name).
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Extend XML completions to the
<interface>block:<interface>, offer<field>and<function>element completions.<field>start tag, offer its attributes (id,type,value,onChange,alwaysNotify,alias).<function>start tag, offername.Builds on #1741. The existing xml snippets are unchanged.