Feature: Enable programmatically pass in api_key besides reading from env

Cargo.toml

@@ -146,3 +146,4 @@ azure_storage_blobs = { version = "0.21.0", default-features = false, features =
     "hmac_rust",
 ] }
 serde_path_to_error = "0.1.17"
+expect-test = "1.5.0"

python/cocoindex/functions.py

@@ -67,6 +67,7 @@ class EmbedText(op.FunctionSpec):
     output_dimension: int | None = None
     task_type: str | None = None
     api_config: llm.VertexAiConfig | None = None
+    api_key: str | None = None
 
 
 class ExtractByLlm(op.FunctionSpec):

python/cocoindex/functions/_engine_builtin_specs.py

@@ -52,6 +52,7 @@ class EmbedText(op.FunctionSpec):
     output_dimension: int | None = None
     task_type: str | None = None
     api_config: llm.VertexAiConfig | None = None
+    api_key: str | None = None
 
 
 class ExtractByLlm(op.FunctionSpec):

python/cocoindex/llm.py

@@ -34,6 +34,61 @@ class OpenAiConfig:
 
     org_id: str | None = None
     project_id: str | None = None
+    api_key: str | None = None
+
+
+@dataclass
+class AnthropicConfig:
+    """A specification for an Anthropic LLM."""
+
+    kind = "Anthropic"
+
+    api_key: str | None = None
+
+
+@dataclass
+class GeminiConfig:
+    """A specification for a Gemini LLM."""
+
+    kind = "Gemini"
+
+    api_key: str | None = None
+
+
+@dataclass
+class VoyageConfig:
+    """A specification for a Voyage LLM."""
+
+    kind = "Voyage"
+
+    api_key: str | None = None
+
+
+@dataclass
+class LiteLlmConfig:
+    """A specification for a LiteLLM LLM."""
+
+    kind = "LiteLlm"
+
+    api_key: str | None = None
+
+
+@dataclass
+class OpenRouterConfig:
+    """A specification for an OpenRouter LLM."""
+
+    kind = "OpenRouter"
+
+    api_key: str | None = None
+
+
+@dataclass
+class VllmConfig:
+    """A specification for a VLLM LLM."""
+
+    kind = "Vllm"
+
+    api_key: str | None = None
 
 
 @dataclass
@@ -43,4 +98,4 @@ class LlmSpec:
     api_type: LlmApiType
     model: str
     address: str | None = None
-    api_config: VertexAiConfig | OpenAiConfig | None = None
+    api_config: VertexAiConfig | OpenAiConfig | AnthropicConfig | GeminiConfig | VoyageConfig | LiteLlmConfig | OpenRouterConfig | VllmConfig | None = None