assistant: Add Bedrock support (#21092)

Closes #16544

Release Notes:

- Added support for AWS Bedrock to the Assistant.

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Anthony Eid <hello@anthonyeid.me>

crates/language_models/Cargo.toml

@@ -14,6 +14,10 @@ path = "src/language_models.rs"
 [dependencies]
 anthropic = { workspace = true, features = ["schemars"] }
 anyhow.workspace = true
+aws-config = { workspace = true, features = ["behavior-version-latest"] }
+aws-credential-types = { workspace = true, features = ["hardcoded-credentials"] }
+aws_http_client.workspace = true
+bedrock.workspace = true
 client.workspace = true
 collections.workspace = true
 credentials_provider.workspace = true
@@ -25,6 +29,7 @@ fs.workspace = true
 futures.workspace = true
 google_ai = { workspace = true, features = ["schemars"] }
 gpui.workspace = true
+gpui_tokio.workspace = true
 http_client.workspace = true
 language_model.workspace = true
 lmstudio = { workspace = true, features = ["schemars"] }
@@ -42,6 +47,7 @@ smol.workspace = true
 strum.workspace = true
 theme.workspace = true
 tiktoken-rs.workspace = true
+tokio = { workspace = true, features = ["rt", "rt-multi-thread"] }
 ui.workspace = true
 util.workspace = true