Add @effect/rpc-fastify package

[mikearnaldi]

Summary

• Adds @effect/rpc-fastify package for integrating @effect/rpc with Fastify servers
• Provides both Effect-based and synchronous APIs for flexibility

APIs

• register - Register RPC handler as a Fastify plugin with automatic content-type parser configuration (recommended)
• registerEffect - Same as register but returns an Effect for integration with existing Effect applications
• toFastifyHandler - Create a handler with a layer, returns { handler, dispose }
• toFastifyHandlerEffect - Create a handler as an Effect, context provided externally

Features

• Full support for streaming RPCs (RpcSchema.Stream)
• Proper backpressure handling for streams
• Client disconnect detection and fiber interruption
• Defect handling with proper error propagation
• MemoMap support for layer sharing
• Middleware support for HTTP app transformation

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Latest commit: dba3970

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