currently `RemoteProviderSpec` has an `AdapterSpec` embedded in it. Remove `AdapterSpec`, and put its leftover fields into `RemoteProviderSpec`.
Additionally, many of the fields were duplicated between `InlineProviderSpec` and `RemoteProviderSpec`. Move these to `ProviderSpec` so they are shared.
Fixup the distro codegen to use `RemoteProviderSpec` directly rather than `remote_provider_spec` which took an AdapterSpec and returned a full provider spec
Signed-off-by: Charlie Doern <cdoern@redhat.com>
# What does this PR do?
Fixes this warning in llama stack build:
```bash
WARNING 2025-09-15 15:29:02,197 llama_stack.core.distribution:149 core: Failed to import module prompts: No module named
'llama_stack.providers.registry.prompts'"
```
## Test Plan
Test added
---------
Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>