GenAI | Update execute tool to have name required

[keith-decker]

Fixes #

area: gen-ai

Changes

When implementing execute tool call in genai-utils for python-contrib, it became apparant that the name of the tool should be required instead of recommended.

Addresses comments in open-telemetry/opentelemetry-python-contrib#4356

Exploring existing genai frameworks shows a few times a tool call name would not be supplied would be during langchain tool streaming chunks, but the tool name would have been provided on the start of the tool call. Openai sdk still lists tool call name as optional in it's protobuf. It appears that a name is provided regardless.

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[lmolkova]

Thanks!

Tool name is required in order to make a tool call - models request which tool to execute using name and server-side tool calls also have it.
It's always available - even with parameterless annotation/decorator - the name is the name of the function.