Replace source code with binary targets to enforce Library Evolution and resolve conflicts

[sajal4me]

Description

Context

This repository serves as a shared wrapper for our internal SDKs and third-party integrations. Previously, it hosted the raw source code of SwiftyRSA directly.

The Problem

We are encountering two critical build issues when integrating with downstream dependencies:

1. Unsafe Flags Error: Xcode blocks "unsafe flags" (specifically those required for Library Evolution support) when using versioned source packages.
2. Diamond Dependency: Multiple internal modules and consumer apps depend on this library. Compiling from source leads to duplicate symbols and target collisions when these modules are integrated together.

The Solution

• Removed Source Code: Deleted the Source/ directory to prevent accidental source compilation and conflicts.
• Switched to Binary Target: Updated Package.swift to use .binaryTarget, pointing to the hosted, pre-compiled XCFramework.
• Enforced Library Evolution: The binary was compiled with BUILD_LIBRARY_FOR_DISTRIBUTION=YES, ensuring ABI stability and compatibility across different Swift compiler versions.

Impact

• Fixes Build: Bypasses the "unsafe flags" restriction by linking the pre-compiled binary instead of compiling source code.
• Deduplication: Allows Swift Package Manager (SPM) to resolve this package as a single shared artifact for all consumers (Core SDKs and Host Apps), preventing "multiple binary target" errors.
• Faster Builds: Eliminates the need to recompile the library during clean builds.

Verification

• Verified checksum matches the hosted XCFramework.
• Confirmed Library Evolution support is enabled in the linked binary.