dot shortcut for FiniteMPS

[borisdevos]

Slightly cheaper this way, and matters somewhat in expectation value calls.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/algorithms/expval.jl	83.33%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/states/finitemps.jl	94.28% <100.00%> (+20.73%)	⬆️
src/algorithms/expval.jl	88.50% <83.33%> (+75.86%)	⬆️

... and 83 files with indirect coverage changes

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[lkdvos]

Do you feel like it might make sense to additionally just replace that in the expectation_value calls directly?