feat(eval api): (2.2/n) delete eval / scoring / scoring_fn apis (#1700)

# What does this PR do?
- To make it easier, delete existing `eval/scoring/scoring_function`
apis. There will be a bunch of broken impls here. The sequence is:
1. migrate benchmark graders
2. clean up existing scoring functions

- Add a skeleton evaluation impl to make tests pass. 

## Test Plan
tested in following PRs

[//]: # (## Documentation)

llama_stack/templates/remote-vllm/build.yaml

@@ -13,15 +13,9 @@ distribution_spec:
     - inline::llama-guard
     agents:
     - inline::meta-reference
-    eval:
-    - inline::meta-reference
     datasetio:
     - remote::huggingface
     - inline::localfs
-    scoring:
-    - inline::basic
-    - inline::llm-as-judge
-    - inline::braintrust
     telemetry:
     - inline::meta-reference
     tool_runtime:

llama_stack/templates/remote-vllm/run-with-safety.yaml

@@ -3,10 +3,8 @@ image_name: remote-vllm
 apis:
 - agents
 - datasetio
-- eval
 - inference
 - safety
-- scoring
 - telemetry
 - tool_runtime
 - vector_io
@@ -50,14 +48,6 @@ providers:
         type: sqlite
         namespace: null
         db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/agents_store.db
-  eval:
-  - provider_id: meta-reference
-    provider_type: inline::meta-reference
-    config:
-      kvstore:
-        type: sqlite
-        namespace: null
-        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/meta_reference_eval.db
   datasetio:
   - provider_id: huggingface
     provider_type: remote::huggingface
@@ -73,17 +63,6 @@ providers:
         type: sqlite
         namespace: null
         db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/localfs_datasetio.db
-  scoring:
-  - provider_id: basic
-    provider_type: inline::basic
-    config: {}
-  - provider_id: llm-as-judge
-    provider_type: inline::llm-as-judge
-    config: {}
-  - provider_id: braintrust
-    provider_type: inline::braintrust
-    config:
-      openai_api_key: ${env.OPENAI_API_KEY:}
   telemetry:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
@@ -136,7 +115,6 @@ shields:
 - shield_id: ${env.SAFETY_MODEL}
 vector_dbs: []
 datasets: []
-scoring_fns: []
 benchmarks: []
 tool_groups:
 - toolgroup_id: builtin::websearch

llama_stack/templates/remote-vllm/run.yaml

@@ -3,10 +3,8 @@ image_name: remote-vllm
 apis:
 - agents
 - datasetio
-- eval
 - inference
 - safety
-- scoring
 - telemetry
 - tool_runtime
 - vector_io
@@ -43,14 +41,6 @@ providers:
         type: sqlite
         namespace: null
         db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/agents_store.db
-  eval:
-  - provider_id: meta-reference
-    provider_type: inline::meta-reference
-    config:
-      kvstore:
-        type: sqlite
-        namespace: null
-        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/meta_reference_eval.db
   datasetio:
   - provider_id: huggingface
     provider_type: remote::huggingface
@@ -66,17 +56,6 @@ providers:
         type: sqlite
         namespace: null
         db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/remote-vllm}/localfs_datasetio.db
-  scoring:
-  - provider_id: basic
-    provider_type: inline::basic
-    config: {}
-  - provider_id: llm-as-judge
-    provider_type: inline::llm-as-judge
-    config: {}
-  - provider_id: braintrust
-    provider_type: inline::braintrust
-    config:
-      openai_api_key: ${env.OPENAI_API_KEY:}
   telemetry:
   - provider_id: meta-reference
     provider_type: inline::meta-reference
@@ -124,7 +103,6 @@ models:
 shields: []
 vector_dbs: []
 datasets: []
-scoring_fns: []
 benchmarks: []
 tool_groups:
 - toolgroup_id: builtin::websearch

llama_stack/templates/remote-vllm/vllm.py

@@ -27,9 +27,7 @@ def get_distribution_template() -> DistributionTemplate:
         "vector_io": ["inline::faiss", "remote::chromadb", "remote::pgvector"],
         "safety": ["inline::llama-guard"],
         "agents": ["inline::meta-reference"],
-        "eval": ["inline::meta-reference"],
         "datasetio": ["remote::huggingface", "inline::localfs"],
-        "scoring": ["inline::basic", "inline::llm-as-judge", "inline::braintrust"],
         "telemetry": ["inline::meta-reference"],
         "tool_runtime": [
             "remote::brave-search",