refactor: remove unused read! and read functions from CDFDataset

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Benchmark Results (Julia v1)

Time benchmarks

	main	d7ceadb...	main / d7ceadb...
elx/full_load	0.0365 ± 0.0022 ms	0.0367 ± 0.0023 ms	0.995 ± 0.087
elx/sum_array	2.68 ± 0.47 μs	2.78 ± 0.5 μs	0.964 ± 0.24
elx/sum_lazy	2.65 ± 1.2 μs	2.59 ± 1.2 μs	1.02 ± 0.66
elx/sum_var_access	3.06 ± 1.1 μs	3.13 ± 0.59 μs	0.978 ± 0.39
elx/var_access	0.32 ± 0.059 μs	0.321 ± 0.011 μs	0.997 ± 0.19
mms/full_load	21.7 ± 2.2 μs	21.4 ± 2.2 μs	1.02 ± 0.15
mms/sum_array	0.0948 ± 0.012 s	0.0952 ± 0.014 s	0.996 ± 0.19
mms/sum_slice	3.55 ± 0.11 ms	3.55 ± 0.12 ms	1 ± 0.045
mms/sum_var_access	3.55 ± 0.1 ms	3.56 ± 0.1 ms	0.999 ± 0.04
mms/var_access	0.11 ± 0.001 μs	0.11 ± 0.01 μs	1 ± 0.091
time_to_load	0.142 ± 0.0047 s	0.144 ± 0.0018 s	0.986 ± 0.035

Memory benchmarks

	main	d7ceadb...	main / d7ceadb...
elx/full_load	0.217 k allocs: 24.8 kB	0.217 k allocs: 24.8 kB	1
elx/sum_array	5 allocs: 27.7 kB	5 allocs: 27.7 kB	1
elx/sum_lazy	5 allocs: 27.7 kB	5 allocs: 27.7 kB	1
elx/sum_var_access	7 allocs: 28 kB	7 allocs: 28 kB	1
elx/var_access	1 allocs: 0.234 kB	1 allocs: 0.234 kB	1
mms/full_load	0.065 k allocs: 6.45 kB	0.065 k allocs: 6.45 kB	1
mms/sum_array	1.03 k allocs: 31.7 MB	1.03 k allocs: 31.7 MB	1
mms/sum_slice	0.064 k allocs: 1.29 MB	0.064 k allocs: 1.29 MB	1
mms/sum_var_access	0.064 k allocs: 1.29 MB	0.064 k allocs: 1.29 MB	1
mms/var_access	1 allocs: 0.219 kB	1 allocs: 0.219 kB	1
time_to_load	0.149 k allocs: 11.2 kB	0.149 k allocs: 11.2 kB	1