refactor!: unify CDFDataset views and multi-source datasets

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Benchmark Results (Julia v1)

Time benchmarks

	main	760ead0...	main / 760ead0...
clip/dataset-epoch	15 ± 0.9 μs	14.8 ± 0.83 μs	1.01 ± 0.084
clip/dataset-variable	25.9 ± 3.7 μs	25.9 ± 1 μs	1 ± 0.15
clip/variable	16.6 ± 11 μs	16.4 ± 0.89 μs	1.01 ± 0.69
concat/dataset/epoch	7.96 ± 0.24 μs	8.15 ± 0.31 μs	0.978 ± 0.048
concat/dataset/variable	8.34 ± 0.3 μs	8.32 ± 0.31 μs	1 ± 0.052
concat/variable/array	4.19 ± 3.8 μs	3.88 ± 3.7 μs	1.08 ± 1.4
concat/variable/construct	9.19 ± 0.4 μs	9.25 ± 0.37 μs	0.994 ± 0.059
dimarray/clip	0.0422 ± 0.0015 ms	0.0432 ± 0.0014 ms	0.978 ± 0.047
dimarray/concat	21.7 ± 1.5 μs	21.5 ± 1.1 μs	1.01 ± 0.086
dimarray/single	8.62 ± 0.44 μs	8.61 ± 0.42 μs	1 ± 0.071
metadata/dataset	30 ± 0 ns	30 ± 0 ns	1 ± 0
metadata/dim	9.23 ± 0.32 μs	9.58 ± 0.37 μs	0.963 ± 0.05
variable/disk/broadcast-realized	6.45 ± 0.59 μs	6.4 ± 0.48 μs	1.01 ± 0.12
variable/disk/maximum	3.26 ± 0.5 μs	3.11 ± 0.4 μs	1.05 ± 0.21
variable/disk/sum	2.99 ± 0.48 μs	2.9 ± 0.41 μs	1.03 ± 0.22
variable/materialize/elfin-flux	2.56 ± 0.48 μs	2.58 ± 0.43 μs	0.992 ± 0.25
variable/materialize/omni-v	0.411 ± 0.09 μs	0.411 ± 0.1 μs	1 ± 0.33
variable/materialized/broadcast	3.83 ± 0.51 μs	3.8 ± 0.36 μs	1.01 ± 0.17
variable/materialized/maximum	0.611 ± 0.01 μs	0.591 ± 0.001 μs	1.03 ± 0.017
variable/materialized/sum	0.381 ± 0.01 μs	0.361 ± 0.001 μs	1.06 ± 0.028
time_to_load	0.194 ± 0.002 s	0.193 ± 0.0047 s	1 ± 0.026

Memory benchmarks

	main	760ead0...	main / 760ead0...
clip/dataset-epoch	0.118 k allocs: 0.0397 MB	0.119 k allocs: 0.0399 MB	0.995
clip/dataset-variable	0.219 k allocs: 0.0453 MB	0.219 k allocs: 0.0453 MB	1
clip/variable	0.124 k allocs: 0.04 MB	0.124 k allocs: 0.04 MB	1
concat/dataset/epoch	0.094 k allocs: 5.41 kB	0.094 k allocs: 5.41 kB	1
concat/dataset/variable	0.094 k allocs: 5.41 kB	0.094 k allocs: 5.41 kB	1
concat/variable/array	17 allocs: 12.1 kB	17 allocs: 12.1 kB	1
concat/variable/construct	0.076 k allocs: 6.8 kB	0.076 k allocs: 6.8 kB	1
dimarray/clip	0.368 k allocs: 0.0553 MB	0.368 k allocs: 0.0553 MB	1
dimarray/concat	0.151 k allocs: 0.0425 MB	0.151 k allocs: 0.0425 MB	1
dimarray/single	0.046 k allocs: 14.4 kB	0.046 k allocs: 14.4 kB	1
metadata/dataset	0 allocs: 0 B	0 allocs: 0 B
metadata/dim	0.096 k allocs: 5.47 kB	0.096 k allocs: 5.47 kB	1
variable/disk/broadcast-realized	24 allocs: 0.0555 MB	24 allocs: 0.0555 MB	1
variable/disk/maximum	5 allocs: 27.7 kB	5 allocs: 27.7 kB	1
variable/disk/sum	5 allocs: 27.7 kB	5 allocs: 27.7 kB	1
variable/materialize/elfin-flux	5 allocs: 27.7 kB	5 allocs: 27.7 kB	1
variable/materialize/omni-v	5 allocs: 3.13 kB	5 allocs: 3.13 kB	1
variable/materialized/broadcast	3 allocs: 27.6 kB	3 allocs: 27.6 kB	1
variable/materialized/maximum	0 allocs: 0 B	0 allocs: 0 B
variable/materialized/sum	0 allocs: 0 B	0 allocs: 0 B
time_to_load	0.145 k allocs: 11 kB	0.145 k allocs: 11 kB	1

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/dataset.jl	86.66%	2 Missing ⚠️

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