Rename build files from TARGETS to BUCK (group ID: -6897691348478859303)

[bigfootjon]

Reviewed By: bigfootjon

Differential Revision: D104414894

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[Copilot]

Pull request overview

Adds a Buck build definition for the examples/models/gemma Python components as part of the ongoing migration/rename from TARGETS to BUCK build files.

Changes:

• Introduces examples/models/gemma/BUCK defining a runtime.python_library target for the Gemma example (sources + config resource + deps).

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