Better Auth Sign-In With Solana (SIWS) Plugin

better-auth-siws is a specialized plugin designed to integrate Sign-In With Solana (SIWS) functionality into applications utilizing the Better Auth framework. Currently at version 0.1.3, this package provides both server-side and client-side plugins (`siwsPlugin` and `siwsClientPlugin` respectively) along with a utility (`buildSiwsMessage`) to construct the canonical SIWS message. It streamlines the implementation of SIWS by offering `start` and `verify` endpoints, abstracting away much of the cryptographic and session management complexity when paired with Better Auth. The package is actively maintained and extends Better Auth's capabilities to support Solana-based authentication flows, differentiating itself by providing a tightly integrated solution specifically for the Better Auth ecosystem.