feat: Adding TLS support for Remote::Milvus vector_io (#2011)

# What does this PR do?
For the Issue :-
#[2010](#2010)
Currently, if we try to connect the Llama stack server to a remote
Milvus instance that has TLS enabled, the connection fails because TLS
support is not implemented in the Llama stack codebase. As a result,
users are unable to use secured Milvus deployments out of the box.

After adding this , the user will be able to connect to remote::Milvus
which is TLS enabled .
if TLS enabled :-
```
vector_io:
  - provider_id: milvus
    provider_type: remote::milvus
    config:
      uri: "http://<host>:<port>"
      token: "<user>:<password>"
      secure: True
      server_pem_path: "path/to/server.pem"
```
[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
I have already tested it by connecting to a Milvus instance which is TLS
enabled and i was able to start llama stack server .

Author: divyaruhil

docs/source/providers/vector_io/milvus.md

@@ -27,5 +27,81 @@ You can install Milvus using pymilvus:
 ```bash
 pip install pymilvus
 ```
+
+## Configuration
+
+In Llama Stack, Milvus can be configured in two ways:
+- **Inline (Local) Configuration** - Uses Milvus-Lite for local storage
+- **Remote Configuration** - Connects to a remote Milvus server
+
+### Inline (Local) Configuration
+
+The simplest method is local configuration, which requires setting `db_path`, a path for locally storing Milvus-Lite files:
+
+```yaml
+vector_io:
+  - provider_id: milvus
+    provider_type: inline::milvus
+    config:
+      db_path: ~/.llama/distributions/together/milvus_store.db
+```
+
+### Remote Configuration
+
+Remote configuration is suitable for larger data storage requirements:
+
+#### Standard Remote Connection
+
+```yaml
+vector_io:
+  - provider_id: milvus
+    provider_type: remote::milvus
+    config:
+      uri: "http://<host>:<port>"
+      token: "<user>:<password>"
+```
+
+#### TLS-Enabled Remote Connection (One-way TLS)
+
+For connections to Milvus instances with one-way TLS enabled:
+
+```yaml
+vector_io:
+  - provider_id: milvus
+    provider_type: remote::milvus
+    config:
+      uri: "https://<host>:<port>"
+      token: "<user>:<password>"
+      secure: True
+      server_pem_path: "/path/to/server.pem"
+```
+
+#### Mutual TLS (mTLS) Remote Connection
+
+For connections to Milvus instances with mutual TLS (mTLS) enabled:
+
+```yaml
+vector_io:
+  - provider_id: milvus
+    provider_type: remote::milvus
+    config:
+      uri: "https://<host>:<port>"
+      token: "<user>:<password>"
+      secure: True
+      ca_pem_path: "/path/to/ca.pem"
+      client_pem_path: "/path/to/client.pem"
+      client_key_path: "/path/to/client.key"
+```
+
+#### Key Parameters for TLS Configuration
+
+- **`secure`**: Enables TLS encryption when set to `true`. Defaults to `false`.
+- **`server_pem_path`**: Path to the **server certificate** for verifying the server’s identity (used in one-way TLS).
+- **`ca_pem_path`**: Path to the **Certificate Authority (CA) certificate** for validating the server certificate (required in mTLS).
+- **`client_pem_path`**: Path to the **client certificate** file (required for mTLS).
+- **`client_key_path`**: Path to the **client private key** file (required for mTLS).
+
 ## Documentation
 See the [Milvus documentation](https://milvus.io/docs/install-overview.md) for more details about Milvus in general.
+
+For more details on TLS configuration, refer to the [TLS setup guide](https://milvus.io/docs/tls.md).

llama_stack/providers/remote/vector_io/milvus/config.py

@@ -6,7 +6,7 @@
 
 from typing import Any
 
-from pydantic import BaseModel
+from pydantic import BaseModel, ConfigDict
 
 from llama_stack.schema_utils import json_schema_type
 
@@ -17,6 +17,8 @@ class MilvusVectorIOConfig(BaseModel):
     token: str | None = None
     consistency_level: str = "Strong"
 
+    model_config = ConfigDict(extra="allow")
+
     @classmethod
     def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> dict[str, Any]:
         return {"uri": "${env.MILVUS_ENDPOINT}", "token": "${env.MILVUS_TOKEN}"}