v1.0.0 of discord_oauth2

A lightweight, secure, and ready-to-use Flutter package to integrate Discord OAuth2 login with PKCE support. Changelog excerpt: - Initial release of discord_oauth2. - Fully secure PKCE (Proof Key for Code Exchange) flow generation using SHA-256 challenges. - High-quality ``featuring official brand Blurple color and Discord asset logo. - Strongly typed exceptions (DiscordAuthCancelledException, DiscordAuthFailedException, DiscordAuthCodeMissingException, and DiscordAuthNetworkException). - Seamless dynamic screen routing and layout configurations for mobile and web integration. - Robust unit[...]