[Swift] Adds a way to store external data and use them directly within the ByteBuffer #6623

Job	Run time
Build Windows C++ (11)	4m 22s
Build Benchmarks (on Linux) (g++-13)	2m 48s
Build Android (on Linux)	4m 24s
Build Windows C++ (14)	4m 36s
Build Dart	1m 10s
Build Windows C++ (17)	4m 23s
Build .NET Windows	1m 39s
Build Windows C++ (20)	6m 14s
Check Generated Code (g++-13)	1m 3s
Check Generated Code on Windows	4m 10s
Build .NET Windows (-p:UnsafeByteBuffer=true)	3m 3s
Build Windows C++ (23)	6m 3s
Check Generated Code (clang++-18)	1m 13s
Build Go	1m 16s
Build Java	18s
Build Kotlin MacOS	5m 5s
Build Kotlin Linux	3m 22s
Build Linux (g++-13)	1m 46s
Build Linux C++ (11, g++-13)	1m 47s
Build Linux (clang++-18)	2m 5s
Build Linux C++ (11, clang++-18)	2m 2s
Build Linux with -DFLATBUFFERS_NO_FILE_TESTS	2m 5s
Build Linux with out-of-source build location	1m 15s
Build Linux C++ (14, g++-13)	1m 44s
Build Mac (for Intel)	1m 28s
Build Mac (universal build)	6m 39s
Build Nim	1m 13s
Build PHP	56s
Build Linux C++ (14, clang++-18)	1m 59s
Build Python	1m 2s
Build Rust Linux	1m 51s
Build Linux C++ (17, g++-13)	1m 53s
Build Rust Windows	1m 27s
Build Linux C++ (17, clang++-18)	2m 9s
Build Swift (5.8)	2m 7s
Build Swift Wasm	3m 34s
Build Linux C++ (20, g++-13)	2m 7s
Build Swift (5.9)	2m 16s
Build Linux C++ (20, clang++-18)	2m 34s
Build TS	1m 20s
Build Swift (5.10)	2m 22s
Build Linux C++ (23, g++-13)	2m 16s
Build Windows 2019	4m 20s
release-digests	0s
provenance	0s
	1h 51m 26s

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