[Breaking] Change the CFT data interface

[VictorVanthilt]

This PR finally changes the CFT data interface to a unified interface.
It introduces a new struct: CFTData with two fields:

• central_charge
• scaling_dimensions

The scaling_dimensions field is a SectorVector, from TensorKit.jl, which has the nice feature that it can be indexed as if it were a vector (using scalar indexes, slices, ...), and also with sectors (e.g. Z2Irrep(0)).

The default shape of transfer matrix is now [sqrt(2), 2sqrt(2), 0], which is both cheap and good.
CFTData can be generated with:

CFTData(scheme) # defaults to [sqrt(2), 2sqrt(2), 0]
CFTData(scheme; shape=shape)
CFTData(scheme; shape=shape, trunc=trunc, truncentanglement=trunc)

where the last signature is used when the shape requires intermediate trunctation to manage comp. cost. (i.e. [1,8,1] and [4 / sqrt(10), 2 * sqrt(10), 2 / sqrt(10)])

The shapes implemented are:

• [1, 1, 0] (trivial ED on a single traced partition function tensor, generates no central charge)
• [sqrt(2), 2sqrt(2), 0]
• [1, 4, 1]
• [1, 8, 1] requires trunc and truncentanglement
• [4 / sqrt(10), 2 * sqrt(10), 2 / sqrt(10)], requires trunc and truncentanglement

What is left to do is add some explanation about this to the documentation.

[codecov]

Codecov Report

❌ Patch coverage is 85.57692% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/utility/cft.jl	87.87%	12 Missing ⚠️
src/utility/finalize.jl	0.00%	3 Missing ⚠️

Files with missing lines	Coverage Δ
src/TNRKit.jl	100.00% <ø> (ø)
src/schemes/ctm/ctm_hotrg.jl	71.42% <100.00%> (+0.69%)	⬆️
src/schemes/ctm/ctm_trg.jl	82.95% <100.00%> (+1.23%)	⬆️
src/utility/finalize.jl	59.40% <0.00%> (+1.71%)	⬆️
src/utility/cft.jl	88.66% <87.87%> (+0.31%)	⬆️

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[github-actions]

After the build completes, the updated documentation will be available here.