Better Auth Instagram Provider

The `better-auth-instagram` package provides an Instagram OAuth provider specifically designed to integrate with the `better-auth` authentication framework. Currently at version 0.0.7, it functions as a plugin, allowing developers to easily add 'Login with Instagram' functionality to their TypeScript applications. It leverages `@better-fetch/fetch` for making robust API requests and `zod` for schema validation, aligning with the `better-auth` ecosystem's focus on type-safety and developer experience. While `better-auth` (currently at 1.4.0) offers a comprehensive, framework-agnostic authentication solution with a plugin-based architecture, `better-auth-instagram` simplifies the complexities of Instagram's OAuth flow, requiring proper setup of an Instagram Business Login API application. Its release cadence is tied to the `better-auth` ecosystem, focusing on incremental improvements and compatibility. Key differentiators include its tight integration with `better-auth`'s plugin system and built-in type safety with Zod.