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Update the proguard rules with precise keep rules and bundle them as consumer-rules.pro #3667

Description

@AjeshRPai

The current documentation recommends broad keep rules
(-keep class com.yourcompany.yourgeneratedcode.** { *; }).

This prevents R8 from stripping unused generated protobuf models, leading to unnecessary app bloat.

Proposed Solution:

Replace the blanket documentation rules with granular ones that only preserve what Wire accesses reflectively (like ADAPTER, @WireField, and Enum Companions).

Ship these exact rules inside a consumer-rules.pro file within the Wire Android/Kotlin runtime artifact for a zero-config, optimized setup.

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