feat: implement get chat completions APIs (#2200)

# What does this PR do?
* Provide sqlite implementation of the APIs introduced in
https://github.com/meta-llama/llama-stack/pull/2145.
* Introduced a SqlStore API: llama_stack/providers/utils/sqlstore/api.py
and the first Sqlite implementation
* Pagination support will be added in a future PR.

## Test Plan
Unit test on sql store:
<img width="1005" alt="image"
src="https://github.com/user-attachments/assets/9b8b7ec8-632b-4667-8127-5583426b2e29"
/>


Integration test:
```
INFERENCE_MODEL="llama3.2:3b-instruct-fp16" llama stack build --template ollama --image-type conda --run
```
```
LLAMA_STACK_CONFIG=http://localhost:5001 INFERENCE_MODEL="llama3.2:3b-instruct-fp16" python -m pytest -v tests/integration/inference/test_openai_completion.py --text-model "llama3.2:3b-instruct-fp16" -k 'inference_store and openai'
```

llama_stack/distribution/build.py

@@ -43,8 +43,20 @@ def get_provider_dependencies(
     # Extract providers based on config type
     if isinstance(config, DistributionTemplate):
         providers = config.providers
+
+        # TODO: This is a hack to get the dependencies for internal APIs into build
+        # We should have a better way to do this by formalizing the concept of "internal" APIs
+        # and providers, with a way to specify dependencies for them.
+        run_configs = config.run_configs
+        additional_pip_packages: list[str] = []
+        if run_configs:
+            for run_config in run_configs.values():
+                run_config_ = run_config.run_config(name="", providers={}, container_image=None)
+                if run_config_.inference_store:
+                    additional_pip_packages.extend(run_config_.inference_store.pip_packages)
     elif isinstance(config, BuildConfig):
         providers = config.distribution_spec.providers
+        additional_pip_packages = config.additional_pip_packages
     deps = []
     registry = get_provider_registry(config)
     for api_str, provider_or_providers in providers.items():
@@ -72,6 +84,9 @@ def get_provider_dependencies(
         else:
             normal_deps.append(package)
 
+    if additional_pip_packages:
+        normal_deps.extend(additional_pip_packages)
+
     return list(set(normal_deps)), list(set(special_deps))