PSR-7, PSR-11, & PSR-15 Integration | Updated Namespace

v2 is a complete rewrite and has breaking changes when compared to v1.

• Streamlined namespace: TheWebSolver\Codegarage\Pipeline
• PSR-7, PSR-15 & Bridge files moved to separate directory: Server
• Converted PipelineBridge class to a facade for type-safety/security & better DX: TheWebSolver\Codegarage\Pipeline\Bridge
• Dependency & auto-wiring support: PSR-11: Container interface
• Dropped Middleware Adapter support. Only supports Middleware that implements: PSR-15: HTTP Server Request Handlers