feat: incoming PDUs processing

[ricardogarim]

graph TD
    Start(Matrix Event) --> Pipeline(Main Sequential Pipeline)
    
    Pipeline --> A(Canonicalize Event)
    A --> B(Parallel Pipeline)
    B --> C(Auth Sequential Pipeline)
    
    B --- B1(Hash Validation)
    B --- B2(Signature Validation)
    
    C --- C1(Fetch Auth Events)
    C1 --> C2(Validate Auth Chain)
    C2 --> C3(Validate Room Rules)
    
    C3 --> Result(Valid Result)
    
    Fail(Invalid Result)
    A -.-> Fail
    B1 -.-> Fail
    B2 -.-> Fail
    C1 -.-> Fail
    C2 -.-> Fail
    C3 -.-> Fail
    
    classDef pipeline fill:#606060,stroke:#c0c0c0,stroke-width:2px,color:#ffffff
    classDef success fill:#2e7d32,stroke:#4caf50,stroke-width:2px,color:#ffffff
    classDef failure fill:#c62828,stroke:#ef5350,stroke-width:2px,color:#ffffff
    classDef step fill:none,stroke:#c0c0c0,stroke-width:1px
    
    class Pipeline,B,C pipeline
    class Result success
    class Fail failure
    class A,B1,B2,C1,C2,C3 step

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[debdutdeb]

https://spec.matrix.org/v1.12/server-server-api/#checks-performed-on-receipt-of-a-pdu