HYBIM-802 Updated utils APIs

[wrisa]

To match new upstream APIs,
added
inference, embedding, tool, workflow

deprecated

start_inference
start_embedding
start_tool
start_workflow

Note:
Not deprecating start_agent and adding invoke_local_agent similar to upstream becaset hese are not a direct equivalent. The splunk-distro start_agent accepts AgentCreation | AgentInvocation (supports two types) and does more work (context stack, conversation root marking, etc.), while the upstream invoke_local_agent is specifically for AgentInvocation with SpanKind.INTERNAL.

[keith-decker]

LGTM, only one non blocking note from codex:

The PR changes public API guidance by marking the start_* factory methods deprecated in favor of the shorter aliases, but the package changelog's [Unreleased] section does not mention that API transition. Prior handler API work in PR 293 updated this changelog, so adding a short Changed entry would make the release notes match the public surface change.