Contribute VertexAI instrumentation

[aabmass]

What problem do you want to solve?

Instrument apps using VertexAI to get the latest GenAI semantic conventions out.

Describe the solution you'd like

Contribute the VertexAI instrumentation from openllmetry into OTel. Also need to update it to use the latest semantic conventions, which involves emitting log events instead of span attributes.

Describe alternatives you've considered

No response

Additional Context

No response

Would you like to implement a fix?

Yes

[aabmass]

#3123 added the boilerplate with the name opentelemetry-instrumentation-vertexai without the -v2 suffix. This was a bit optimistic as we are discussing the possibility of not adding -v2 packages. See thread #3123 (comment) for more discussion

[aabmass]

Closing this out as we have just made the first release https://pypi.org/project/opentelemetry-instrumentation-vertexai/2.0b0/