Support multiple OpenAI compatible providers (#34212)

TODO
- [x] OpenAI Compatible API Icon
- [x] Docs
- [x] Link to docs in OpenAI provider section about configuring OpenAI
API compatible providers

Closes #33992

Related to #30010

Release Notes:

- agent: Add support for adding multiple OpenAI API compatible providers

---------

Co-authored-by: MrSubidubi <dev@bahn.sh>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/language_model/src/language_model.rs

@@ -735,6 +735,18 @@ impl From<String> for LanguageModelProviderName {
     }
 }
 
+impl From<Arc<str>> for LanguageModelProviderId {
+    fn from(value: Arc<str>) -> Self {
+        Self(SharedString::from(value))
+    }
+}
+
+impl From<Arc<str>> for LanguageModelProviderName {
+    fn from(value: Arc<str>) -> Self {
+        Self(SharedString::from(value))
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;