perf(swift): add fory swift serialization benchmark and optimize perf

[chaokunyang]

Why?

• Add a reproducible Swift benchmark suite across fory/protobuf/msgpack and document current performance.
• Optimize Swift serialization/deserialization hot paths without changing the Fory protocol.

What does this PR do?

• Adds a new Swift benchmark suite under benchmarks/swift:
  • benchmark harness, datasets, and runners (BenchmarkRunner, main.swift)
  • protobuf schema + generated Swift bindings for parity (bench.proto, bench.pb.swift)
  • one-command run script and markdown/plot report generator (run.sh, benchmark_report.py)
• Optimizes Swift runtime hot paths in core serialization/deserialization:
  • ByteBuffer varint/buffer paths
  • collection/object serializer paths (CollectionSerializers, Serializer, Fory, Context, RefResolver)
  • macro and type metadata plumbing updates (ForyObjectMacro, TypeMeta, TypeResolver)
• Avoids an extra UTF-8 byte copy in the string decode path.
• Refactors type-id naming: ForyTypeId -> TypeId (swift/Sources/TypeId.swift).
• Includes CI follow-up fixes:
  • style-format benchmarks/swift/benchmark_report.py
  • simplify two large UInt64 varint expressions in ByteBuffer to avoid Swift compiler type-check timeout on macOS CI.

Related issues

#3349
#3355

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?

Benchmark

Swift benchmark result (benchmarks/swift/results/REPORT.md)

Key	Value
Timestamp	2026-02-24T09:07:22Z
OS	Version 15.7.2 (Build 24G325)
Host	macbook-pro.local
CPU Cores (Logical)	12
Memory (GB)	48.00
Duration per case (s)	3

Datatype	Operation	Fory TPS	Protobuf TPS	Msgpack TPS	Fastest
Struct	Serialize	6,594,978	6,510,524	143,221	fory (1.01x)
Struct	Deserialize	21,546,392	9,413,296	99,321	fory (2.29x)
Sample	Serialize	2,830,973	1,292,133	16,805	fory (2.19x)
Sample	Deserialize	1,043,252	752,382	12,515	fory (1.39x)
MediaContent	Serialize	1,487,110	667,043	28,348	fory (2.23x)
MediaContent	Deserialize	895,491	466,411	12,605	fory (1.92x)
StructList	Serialize	2,238,338	1,019,259	24,186	fory (2.20x)
StructList	Deserialize	2,737,618	803,488	8,600	fory (3.41x)
SampleList	Serialize	600,480	195,762	3,314	fory (3.07x)
SampleList	Deserialize	170,963	123,110	1,500	fory (1.39x)
MediaContentList	Serialize	330,343	103,388	5,472	fory (3.20x)
MediaContentList	Deserialize	173,235	86,549	1,499	fory (2.00x)

Datatype	Fory	Protobuf	Msgpack
MediaContent	287	301	524
MediaContentList	1435	1520	2639
Sample	380	375	737
SampleList	1900	1890	3698
Struct	28	61	65
StructList	140	315	338