Improve parallel data transfer mechanics

[willow-ahrens]

this PR improves the data transfer mechanics for parallel compilation, making it cleaner and more complete. This is required to finish #697

[codecov]

Codecov Report

Attention: Patch coverage is 61.72249% with 240 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/architecture.jl	56.86%	44 Missing ⚠️
src/tensors/scalars.jl	31.11%	31 Missing ⚠️
src/tensors/levels/mutex_levels.jl	60.71%	11 Missing ⚠️
src/tensors/levels/sparse_dict_levels.jl	59.25%	11 Missing ⚠️
ext/SparseArraysExt.jl	68.75%	10 Missing ⚠️
src/tensors/levels/sparse_rle_levels.jl	64.28%	10 Missing ⚠️
src/tensors/levels/dense_rle_levels.jl	57.14%	9 Missing ⚠️
src/tensors/levels/sparse_bytemap_levels.jl	77.50%	9 Missing ⚠️
src/tensors/levels/sparse_vbl_levels.jl	60.86%	9 Missing ⚠️
src/interface/abstract_arrays.jl	46.66%	8 Missing ⚠️
... and 19 more

Files with missing lines	Coverage Δ
src/Finch.jl	94.68% <ø> (ø)
src/abstract_tensor.jl	94.11% <ø> (ø)
src/interface/abstract_unit_ranges.jl	63.63% <100.00%> (+1.73%)	⬆️
src/lower.jl	88.34% <100.00%> (+1.30%)	⬆️
src/tensors/levels/dense_levels.jl	93.38% <100.00%> (+1.14%)	⬆️
src/tensors/combinators/protocolized.jl	61.11% <50.00%> (-0.52%)	⬇️
src/tensors/combinators/unfurled.jl	90.24% <50.00%> (-2.07%)	⬇️
src/tensors/levels/element_levels.jl	85.57% <87.50%> (-0.84%)	⬇️
src/tensors/levels/atomic_element_levels.jl	53.84% <80.00%> (+0.44%)	⬆️
src/tensors/levels/separate_levels.jl	74.12% <78.57%> (-0.18%)	⬇️
... and 24 more

... and 2 files with indirect coverage changes

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