[ntuple] Make `RNTupleChainProcessor` composable #15658

Job	Run time
Windows 10 x64 Release	1h 4m 13s
mac13 ARM64 LLVM_ENABLE_ASSERTIONS=On, builtin_zlib=ON	29m 57s
Windows 10 x86 Release	1h 0m 3s
mac14 X64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 8m 7s
mac15 ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 13m 50s
mac-beta ARM64 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	53m 31s
Upload Event Payload	2s
fedora40 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	51m 40s
fedora41 LLVM_ENABLE_ASSERTIONS=On	1h 33m 36s
alma8 LLVM_ENABLE_ASSERTIONS=On	1h 35m 56s
alma9 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	1h 52m 35s
ubuntu22 imt=Off, LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 21m 4s
ubuntu2404 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 23m 25s
ubuntu2410 LLVM_ENABLE_ASSERTIONS=On, CMAKE_BUILD_TYPE=Debug	2h 9m 38s
debian125 LLVM_ENABLE_ASSERTIONS=On, CMAKE_CXX_STANDARD=20	1h 55m 56s
alma9 modules_off runtime_cxxmodules=Off	1h 12m 32s
alma9 march_native CMAKE_BUILD_TYPE=RelWithDebInfo, CMAKE_CXX_FLAGS=-march=native, CMAKE_C_FLAGS=-march=native, fortran=OFF	57m 52s
alma9 arm64 CMAKE_BUILD_TYPE=RelWithDebInfo	1h 8m 23s
alma9-clang clang LLVM_ENABLE_ASSERTIONS=On, CMAKE_C_COMPILER=clang, CMAKE_CXX_COMPILER=clang++	1h 23m 55s
	1d 1h 16m 15s

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