ADK V2 service_tier support

[harames2001]

Pls implement default service_tier support for adk v2

[sanketpatil06]

Hi @harames2001 , Thanks for the suggestion. Could you please provide more details on this? We would appreciate any additional information you can share to help us better understand your request.

[harames2001]

The Google API also supports different modes with different pricing (Flex | Priority | Standard).
Requesting a default mode for ADK V2 to natively support service_tiers.
*See https://ai.google.dev/gemini-api/docs/flex-inference