Implement PTMRG

[VictorVanthilt]

This PR implements the PTMRG algorithm from https://arxiv.org/pdf/2411.12731
To do before merging:

• Implement tests
• Figure out how to get free energies from the data
• Figure out which norms to take as data
• Figure out how to normalize the h, v and C tensors
• Check if the contraction ordering for the HOTRG projectors is optimal. (In HOTRG all legs have the same dimension, in PTMRG there is a big difference between the two tensors being merged)

[VictorVanthilt]

@sanderdemeyer You're calculating an eigenvalue decomposition of a map that isn't square on line 41 of c3vctm_honecomb.jl. Can you fix this?

[sanderdemeyer]

@sanderdemeyer You're calculating an eigenvalue decomposition of a map that isn't square on line 41 of c3vctm_honecomb.jl. Can you fix this?

This problem should be resolved by #178.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/schemes/ptmrg.jl	0.00%	17 Missing ⚠️
src/utility/finalize.jl	0.00%	6 Missing ⚠️

Files with missing lines	Coverage Δ
src/utility/finalize.jl	56.07% <0.00%> (-3.34%)	⬇️
src/schemes/ptmrg.jl	0.00% <0.00%> (ø)

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