Braidingtensor improvements

[lkdvos]

This PR fixes some things about BraidingTensor that were either not working or just wrong, along with fixing the whole braid(::AbstractTensorMap) part of the code since apparently that was just not working.
It also adds some tests to catch this better in the future

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.85%. Comparing base (f467a21) to head (acaef58).

Files with missing lines	Patch %	Lines
src/tensors/treetransformers.jl	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   81.39%   82.85%   +1.45%     
==========================================
  Files          42       42              
  Lines        5218     5219       +1     
==========================================
+ Hits         4247     4324      +77     
+ Misses        971      895      -76     

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[Jutho]

It seems like you managed to break LRUCache?

[lkdvos]

It was just infinite recursion: TensorMap(::BraidingTensor) calls blocks(::BraidingTensor) which was defined as blocks(TensorMap(::BraidingTensor)), and the stack just ran out of space in the hash 😉

[lkdvos]

This should be ready to go