feat(Codey): Add python sdk samples for Codey API

[yil532]

Description

Fixes #

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• generative_ai/code_chat.py:15, tag aiplatform_sdk_code_chat
• generative_ai/code_completion_function.py:15, tag aiplatform_sdk_code_completion_comment
• generative_ai/code_completion_test_function.py:15, tag aiplatform_sdk_code_completion_test_function
• generative_ai/code_generation_function.py:15, tag aiplatform_sdk_code_generation_function
• generative_ai/code_generation_unittest.py:15, tag aiplatform_sdk_code_generation_unittest

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[yil532]

Will come back and check once the model is published on endpoint (Pypi).

[leahecole]

Converting this to a draft for now @yil532 - once you're ready for review please

• switch it back to a regular pr
• add the blunderbuss:assign label to make sure you get a reviewer assigned :)

[yil532]

I wonder why this takes forever to run the tests?

[engelke]

I think it would be better if this prompt were an argument to the function, not hard coded here.

[engelke]

Also, could the prompt be to calculate the minimum or smaller of two numbers, instead of "min"?

[engelke]

The prompt could be hard-coded here, or be the default value of the function argument.