[Feature] Add Google-style docstrings for dspy/teleprompt/mipro_optimizer_v2.py MIPROv2 class

[azai91]

What feature would you like to see?

I am using the MIPROv2 optimizer for work, I would like to improve docstring coverage for the init and compile methods to help others.

Ref: #8926

Would you like to contribute?

• Yes, I'd like to help implement this.
• No, I just want to request it.

Additional Context

No response

[chenmoneygithub]

@azai91 Thank you! Looking forward to your PR!