Add Embedders settings

[stephanedemotte]

To allow embedders settings i have to add public ?array $embedders = null; in models/IndexSettings it's maybe not the best way to allow something like

  'pages' => IndexBuilder::fromSettings([
    "embedders" => [
      "openai-embedder" => [
    	 "source" => "openAi",
    	 "model" => "text-embedding-ada-002",
    	 "apiKey" => "sk-proj-FlQsXHNdI1w0M4i...",
    	 "documentTemplate" => "This document is about {{doc.title}}.",
	]
     ]
  ])

No php errors, but not working, my index settings still not have my embedders value.

Maybe there are a better way to use custom settings ?

Thank !