fs: enable chunked reading for large files in readFileHandle #1794

Job	Run time
Build slim tarball	1m 34s
x86_64-darwin: with shared libraries	44m 54s
aarch64-linux: with shared libraries	24m 42s
aarch64-darwin: with shared libraries	23m 47s
x86_64-linux: with shared libraries	29m 38s
	2h 4m 35s

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