Add RAMCES template

Author: mruffalo

src/user_templates_api/templates/jupyter_lab/templates/ramces/README.md

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+# RAMCES
+This template demonstrates prediction of markers usable for cell segmentation.

src/user_templates_api/templates/jupyter_lab/templates/ramces/metadata.json

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+{
+  "title": "RAMCES cell marker prediction",
+  "description": "Rank channels for cell segmentation in spatial proteomics datasets",
+  "tags": ["codex"], 
+  "is_multi_dataset_template": false,
+  "template_format": "jinja",
+  "examples": [
+    {
+      "title": "RAMCES on lung PhenoCycler",
+      "description": "Predict segmentation channels for PhenoCycler data from lung",
+      "datasets": ["70637954487c4f20828b30841b68f1e5"]
+    }
+  ],
+  "is_hidden": false
+}

src/user_templates_api/templates/jupyter_lab/templates/ramces/render.py

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+from user_templates_api.templates.jupyter_lab.render import JupyterLabRender
+
+
+class JupyterLabExampleJinjaRender(JupyterLabRender):
+    def __init__(self):
+        pass