Intergrate the heatmap generation with the API

Issue:
https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/clustering.gmi

* Intergrate the heatmap generation code on the /api/heatmaps/clustered
  endpoint.

  The endpoint should take a json query of the form:

      {"traits_names": [ ... ] }

  where the "traits_name" value is a list of the full names of traits.

  A sample query to the endpoint could be something like the following:

      curl -i -X POST "http://localhost:8080/api/heatmaps/clustered" \
           -H "Accept: application/json" \
           -H "Content-Type: application/json" \
           -d '{
          "traits_names": [
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM103710672",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM2260338",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM3140576",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM5670577",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM2070121",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM103990541",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM1190722",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM6590722",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM4200064",
      	    "UCLA_BXDBXH_CARTILAGE_V2::ILM3140463"
          ]
      }'

  which should respond with a json response containing the raw binary string
  for the png format and possibly another for the svg format.

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