feat: add Google Vertex AI as provider to utilize gemini via GCP

[mfahlandt]

📑 Description

Adds VertexAI of GCP as a possible provider - this was asked as a possible feature here: https://k8sgpt.slack.com/archives/C050SKW7SHF/p1708033891149459

Another reason for adding it - currently Gemini API is not supported in a lot of regions (e.g. any EU Country + Australia) but Vertex AI is available to be used via GCP (https://ai.google.dev/available_regions)

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required DocsPR
• All the tests have passed

ℹ Additional Information

[mfahlandt]

/retest

[arbreezy]

It lgtm but can't test it as I dont have vertex ai, it will be nice if you can share a screenshot of vertex integration while running k8sgpt analyze -e

[JuHyung-Son]

overall looks good.
i just comment minor comments.

and does what if gemini API support other regions? then maybe we don't need to maintain this provider.

does it takes long time to gemini API supports other regions??

[mfahlandt]

It lgtm but can't test it as I dont have vertex ai, it will be nice if you can share a screenshot of vertex integration while running k8sgpt analyze -e

Shure:

[mfahlandt]

and does what if gemini API support other regions? then maybe we don't need to maintain this provider.

does it takes long time to gemini API supports other regions??

We could potentially then remove this provider.
For now Vertex is the only option to use Gemini in GCP and this might still be the case after Gemini API expands, as the billing is different as it looks like.
In this Slack Thread the request was because the company does allow GCP but not Gemini Studio.
I would treat it the same way as Bedrock & Sagemaker are treated for AWS.
The main issue is also for Gemini API this is more of a Law topic, as Gemini API is basically not supported in any region with extensive GDPR laws - e.g. EU/GB/Australia - my bet as a european this will take some time.

[JuHyung-Son]

overall good!

and need to resolve DCO

[mfahlandt]

overall good!

and need to resolve DCO

yeah the signing was missing, for whatever reason :(
Thanks for the review!