docs: Add eval Components docs config (#6984)

* Add eval components docs config

* Update order

Co-authored-by: Daria Fokina <daria.fokina@deepset.ai>

---------

Co-authored-by: Daria Fokina <daria.fokina@deepset.ai>

docs/pydoc/config/eval_api.yml

@@ -0,0 +1,26 @@
+loaders:
+  - type: haystack_pydoc_tools.loaders.CustomPythonLoader
+    search_path: [../../../haystack/components/eval]
+    modules: ["sas_evaluator", "statistical_evaluator"]
+    ignore_when_discovered: ["__init__"]
+processors:
+  - type: filter
+    expression:
+    documented_only: true
+    do_not_filter_modules: false
+    skip_empty_modules: true
+  - type: smart
+  - type: crossref
+renderer:
+  type: haystack_pydoc_tools.renderers.ReadmePreviewRenderer
+  excerpt: Enables evaluation of LLMs generated answers.
+  category_slug: haystack-api
+  title: Evaluation
+  slug: eval-api
+  order: 63
+  markdown:
+    descriptive_class_title: false
+    descriptive_module_title: true
+    add_method_class_prefix: true
+    add_member_class_prefix: false
+    filename: eval_api.md