refactor(test): move tools, evals, datasetio, scoring and post training tests (#1401)

All of the tests from `llama_stack/providers/tests/` are now moved to
`tests/integration`.

I converted the `tools`, `scoring` and `datasetio` tests to use API.
However, `eval` and `post_training` proved to be a bit challenging to
leaving those. I think `post_training` should be relatively
straightforward also.

As part of this, I noticed that `wolfram_alpha` tool wasn't added to
some of our commonly used distros so I added it. I am going to remove a
lot of code duplication from distros next so while this looks like a
one-off right now, it will go away and be there uniformly for all
distros.

llama_stack/templates/fireworks/run-with-safety.yaml

@@ -86,6 +86,9 @@ providers:
     config:
       api_key: ${env.TAVILY_SEARCH_API_KEY:}
       max_results: 3
+  - provider_id: wolfram-alpha
+    provider_type: remote::wolfram-alpha
+    config: {}
   - provider_id: code-interpreter
     provider_type: inline::code-interpreter
     config: {}
@@ -225,6 +228,8 @@ benchmarks: []
 tool_groups:
 - toolgroup_id: builtin::websearch
   provider_id: tavily-search
+- toolgroup_id: builtin::wolfram_alpha
+  provider_id: wolfram-alpha
 - toolgroup_id: builtin::rag
   provider_id: rag-runtime
 - toolgroup_id: builtin::code_interpreter