Add language_models crate to house language model providers (#20945)

This PR adds a new `language_models` crate to house the various language
model providers.

By extracting the provider definitions out of `language_model`, we're
able to remove `language_model`'s dependency on `editor`, which improves
incremental compilation when changing `editor`.

Release Notes:

- N/A

Cargo.lock

@@ -402,6 +402,7 @@ dependencies = [
  "indoc",
  "language",
  "language_model",
+ "language_models",
  "languages",
  "log",
  "lsp",
@@ -6520,27 +6521,48 @@ dependencies = [
  "anthropic",
  "anyhow",
  "base64 0.22.1",
- "client",
  "collections",
- "copilot",
- "ctor",
- "editor",
- "env_logger 0.11.5",
- "feature_flags",
  "futures 0.3.31",
  "google_ai",
  "gpui",
  "http_client",
  "image",
- "language",
  "log",
- "menu",
  "ollama",
  "open_ai",
  "parking_lot",
+ "proto",
+ "schemars",
+ "serde",
+ "serde_json",
+ "smol",
+ "strum 0.25.0",
+ "ui",
+ "util",
+]
+
+[[package]]
+name = "language_models"
+version = "0.1.0"
+dependencies = [
+ "anthropic",
+ "anyhow",
+ "client",
+ "collections",
+ "copilot",
+ "editor",
+ "feature_flags",
+ "fs",
+ "futures 0.3.31",
+ "google_ai",
+ "gpui",
+ "http_client",
+ "language_model",
+ "menu",
+ "ollama",
+ "open_ai",
  "project",
  "proto",
- "rand 0.8.5",
  "schemars",
  "serde",
  "serde_json",
@@ -6548,12 +6570,10 @@ dependencies = [
  "smol",
  "strum 0.25.0",
  "telemetry_events",
- "text",
  "theme",
  "thiserror 1.0.69",
  "tiktoken-rs",
  "ui",
- "unindent",
  "util",
 ]
 
@@ -15481,6 +15501,7 @@ dependencies = [
  "journal",
  "language",
  "language_model",
+ "language_models",
  "language_selector",
  "language_tools",
  "languages",