Renamed cplusplus feature to ffi

[LarryOsterman]

No description provided.

[Copilot]

Pull Request Overview

This PR renames the "cplusplus" feature to "ffi" throughout the azure_core_amqp crate to better align with Rust naming conventions. The Foreign Function Interface (FFI) feature provides functionality for serialization and deserialization of AMQP types, which is more accurately described as FFI rather than being C++-specific.

Key changes:

• Updated all #[cfg(feature = "cplusplus")] directives to use "ffi" instead
• Modified the feature definition in Cargo.toml
• Added changelog entry documenting the breaking change

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sdk/core/azure_core_amqp/src/value.rs	Updated feature gates from "cplusplus" to "ffi" for AmqpComposite types and serialization traits
sdk/core/azure_core_amqp/src/messaging.rs	Updated feature gates for FFI-related implementations of AMQP messaging types
sdk/core/azure_core_amqp/src/lib.rs	Updated feature gates for Serializable and Deserializable traits and exports
sdk/core/azure_core_amqp/src/fe2o3/value.rs	Updated feature gates for AmqpComposite handling in fe2o3 integration
sdk/core/azure_core_amqp/Cargo.toml	Renamed the feature definition from "cplusplus" to "ffi"
sdk/core/azure_core_amqp/CHANGELOG.md	Added changelog entry documenting the breaking change