v0.1.0 of supabase_client_gen

Contract-driven code generator that reads a supabase.yaml specification and produces typed Dart client code — data models, enums, repositories with CRUD and realtime streams, and edge function clients. Changelog excerpt: - Initial release. - Contract-driven code generation from supabase.yamlto typed Dart. - Data models with fromJson/toJsonand null-safety. - Enums from Postgres enum types. - Repository classes with .select(), .insert(), .update(), .delete(), .stream(). - Edge function clients with typed request/response. - CLI tools: generateand validate. - Optional live DB nullability detection via --with-db. - Full validation pipeline: DB ↔ Contract ↔ Generated Code ↔ TS Types ↔ Migrations.