Refactor FileStream and HiCFileWriter to be more robust against data races #1242

Job	Run time
Generate job matrix	4s
Build Conan deps / Build dependencies with Conan (${{ inputs.os }})	0s
Build Conan deps / Build dependencies with Conan (ubuntu-20.04)	36s
Build Conan deps / Build dependencies with Conan (${{ inputs.os }})	0s
Cache test dataset / Cache test datasets	7s
Build Conan deps / Collect output	1s
Build project (gcc-8, ubuntu-20.04, Ninja, 3.29.*, Debug, OFF)	13m 52s
Build project (gcc-14, ubuntu-24.04, Ninja, 3.29.*, Debug, ON)	39m 39s
Build project (clang-8, ubuntu-20.04, Ninja, 3.29.*, Debug, OFF)	13m 39s
Build project (clang-18, ubuntu-24.04, Ninja, 3.29.*, Debug, ON)	15m 32s
Build project (gcc-14, ubuntu-24.04, Ninja, 3.29.*, Release, ON)	1h 7m 39s
Build project (clang-18, ubuntu-24.04, Ninja, 3.29.*, Release, ON)	30m 10s
Run unit tests	1s
Clean stale Ccache cache	1s
Run integration tests	1s
Status Check (Ubuntu CI)	1s
	3h 1m 23s

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