feat(swift): dynamic any serializer for polymorphism

[chaokunyang]

Why?

Swift xlang polymorphism currently relies on a custom AnyAnimal bridge in the peer, which makes dynamic payload handling narrow and hard to extend. This PR adds first-class dynamic Any serialization so polymorphic lists/maps can round-trip through the core runtime and macro-generated models directly.

What does this PR do?

• Add AnySerializer.swift with runtime Any codec support, including dynamic type info read/write, null sentinel handling, and dynamic payload encode/decode helpers.
• Add dynamic container helpers for [Any], [String: Any], and [Int32: Any] (including map key-type probing for dynamic map decode).
• Expose WriteContext/ReadContext convenience APIs and new Fory overloads for serializing/deserializing dynamic Any collections in both buffer and stream-style entry points.
• Extend TypeResolver to parse dynamic wire type metadata and decode dynamic values (primitive/array/list/map/registered types) by id or name, with registration-mode tracking.
• Add RefReader.readRefValue(_:) support used by dynamic Any reference resolution.
• Extend @ForyObject macro generation to support Any, [Any], [String: Any], and [Int32: Any] fields with generated read/write paths and compatibility metadata handling; reject unsupported Set<Any> and unsupported dictionary key types.
• Simplify ForySwiftXlangPeer polymorphic handlers by removing the custom AnyAnimal codec and switching to native [Any] / [String: Any] round-trips.

Related issues

Closes #3367
#1017 #3349

Does this PR introduce any user-facing change?

• Does this PR introduce any public API change?
• Does this PR introduce any binary protocol compatibility change?

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