Migrate file I/O to file-io #146

Job	Run time
build (macOS-13, lts-13.30, bytestring-0.11.3.0, file-io-0.1.2, filepath-1.4.100.0, unix-2.8.0.0)	7m 26s
build (macos-latest, lts-22.7, bytestring-0.11.5.3, file-io-0.1.2, filepath-1.5.2.0, os-string-2....	4m 56s
build (ubuntu-latest, 8.6.5, 3.0.0.0, before_prepare() { sed -i.bak /utimensat/d configure.ac; })	4m 46s
build (ubuntu-latest, 8.10.7, 3.8.1.0)	4m 30s
build (ubuntu-latest, 9.0.2, 3.8.1.0)	4m 27s
build (ubuntu-latest, 9.2.4, 3.8.1.0)	3m 38s
build (ubuntu-latest, 9.4.3, 3.8.1.0)	4m 7s
build (ubuntu-latest, latest, latest, +os-string, -Werror=deprecations)	1m 50s
build (windows-latest, lts-13.30, bytestring-0.11.3.0, file-io-0.1.2, filepath-1.4.100.0, time-1....	7m 33s
build (windows-latest, lts-17.5, bytestring-0.11.3.0, file-io-0.1.2, filepath-1.4.100.0, time-1.9...	12m 24s
build (windows-latest, lts-22.7, bytestring-0.11.5.3, file-io-0.1.2, filepath-1.5.2.0, os-string-...	8m 41s
	1h 4m 18s

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