Alternative blocked permutation interface for contract

[mtfishman]

This adds an alternative blocked permutation interface contract(randn(2, 2, 2), (2,), (3, 1), randn(2, 2, 2), (2, 1), (3,)), which is now the preferred overload interface (for the analogous interface at the contractadd! level). The main reason is to let users call and overload those functions without special blocked permutation constructors and types (i.e. so users don't have to call contract(randn(2, 2, 2), permmortar(((2,), (3, 1))), randn(2, 2, 2), permmortar(((2, 1), (3,)))), which is equivalent to the above call). Blocked permutation versions are still available but are mostly meant to be internal.

[codecov]

Codecov Report

❌ Patch coverage is 72.48322% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.56%. Comparing base (2efd54e) to head (e231b30).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rOperationsExt/TensorAlgebraTensorOperationsExt.jl	35.48%	20 Missing ⚠️
src/contract/contract.jl	42.30%	15 Missing ⚠️
ext/TensorAlgebraBlockArraysExt/blockedtuple.jl	86.66%	2 Missing ⚠️
src/blockedtuple.jl	93.10%	2 Missing ⚠️
src/contract/contractalgorithm.jl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
- Coverage   73.48%   72.56%   -0.92%     
==========================================
  Files          22       24       +2     
  Lines        1090     1152      +62     
==========================================
+ Hits          801      836      +35     
- Misses        289      316      +27     

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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