fs: enable chunked reading for large files in readFileHandle #1792

Job	Run time
Build slim tarball	1m 36s
x86_64-linux: with shared libraries	31m 1s
aarch64-darwin: with shared libraries	27m 28s
aarch64-linux: with shared libraries	25m 47s
x86_64-darwin: with shared libraries	38m 56s
	2h 4m 48s

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