Add support for parsing `eXIf` chunk. (#568) #688

Job	Run time
rustfmt	4s
powerpc_cross	42s
feature_check (ubuntu-latest)	22s
build (1.65.0, ubuntu-latest)	1m 57s
feature_check (macos-latest)	24s
test_all (ubuntu-latest)	3m 9s
feature_check (unstable, ubuntu-latest)	23s
build (1.65.0, windows-latest)	2m 38s
test_all (macos-latest)	2m 27s
feature_check (unstable, macos-latest)	27s
build (1.65.0, macos-latest)	2m 8s
feature_check (benchmarks, ubuntu-latest)	26s
build (stable, ubuntu-latest)	9s
build (stable, windows-latest)	1m 16s
feature_check (benchmarks, macos-latest)	24s
build (stable, macos-latest)	11s
build (beta, ubuntu-latest)	13s
build (beta, windows-latest)	37s
build (beta, macos-latest)	16s
build (nightly, ubuntu-latest)	12s
build (nightly, windows-latest)	33s
build (nightly, macos-latest)	15s
	19m 13s

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