Add a `$dynamicRef` benchmark case #4895

Job	Run time
test (macos-latest, clang, clang++, static, sh, macos/llvm)	4m 55s
test (macos-latest, clang, clang++, shared, sh)	3m 35s
test (macos-latest, gcc-13, g++-13, static, sh)	9m 2s
test (ubuntu-latest, clang, clang++, static, sh, linux/llvm)	6m 47s
test (ubuntu-latest, gcc, g++, static, sh, linux/gcc)	8m 39s
test (ubuntu-latest, clang, clang++, shared, sh)	5m 56s
test (ubuntu-latest, gcc, g++, shared, sh)	6m 57s
test (windows-latest, static, pwsh, windows/msvc)	9m 58s
test (windows-latest, shared, pwsh)	9m 31s
test (ubuntu-latest, clang, clang++, static, sh, -DJSONTOOLKIT_ADDRESS_SANITIZER:BOOL=ON)	7m 16s
test (ubuntu-latest, clang, clang++, static, sh, -DJSONTOOLKIT_UNDEFINED_SANITIZER:BOOL=ON)	7m 38s
	1h 20m 14s

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