Adding support for wildcard models in the model_providers config (#696)

* cleaning up plano cli commands

* adding support for wildcard model providers

* fixing compile errors

* fixing bugs related to default model provider, provider hint and duplicates in the model provider list

* fixed cargo fmt issues

* updating tests to always include the model id

* using default for the prompt_gateway path

* fixed the model name, as gpt-5-mini-2025-08-07 wasn't in the config

* making sure that all aliases and models match the config

* fixed the config generator to allow for base_url providers LLMs to include wildcard models

* re-ran the models list utility and added a shell script to run it

* updating docs to mention wildcard model providers

* updated provider_models.json to yaml, added that file to our docs for reference

* updating the build docs to use the new root-based build

---------

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-342.local>

demos/samples_python/currency_exchange/hurl_tests/simple.hurl

@@ -8,7 +8,7 @@ Content-Type: application/json
       "content": "convert 100 eur"
     }
   ],
-  "model": "none"
+  "model": "gpt-4o"
 }
 HTTP 200
 [Asserts]

demos/samples_python/currency_exchange/hurl_tests/simple_stream.hurl

@@ -9,7 +9,7 @@ Content-Type: application/json
     }
   ],
   "stream": true,
-  "model": "none"
+  "model": "gpt-4o"
 }
 HTTP 200
 [Asserts]