Deep copying MPS with copy

[20akshay00]

Fixes #386. Probably should add more tests also for copy operations on all other objects like MPOs.

[github-actions]

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diff --git a/test/states/infinitemps.jl b/test/states/infinitemps.jl
index 9389fe2..1c34162 100644
--- a/test/states/infinitemps.jl
+++ b/test/states/infinitemps.jl
@@ -12,7 +12,7 @@ using TensorKit
 using TensorKit: ℙ
 
 @testset "InfiniteMPS ($(sectortype(D)), $elt)" for (D, d, elt) in
-                                                    [(ℙ^10, ℙ^2, ComplexF64), (Rep[U₁](1 => 3), Rep[U₁](0 => 1), ComplexF64)]
+    [(ℙ^10, ℙ^2, ComplexF64), (Rep[U₁](1 => 3), Rep[U₁](0 => 1), ComplexF64)]
     tol = Float64(eps(real(elt)) * 100)
 
     ψ = InfiniteMPS([rand(elt, D * d, D), rand(elt, D * d, D)]; tol)
@@ -31,7 +31,7 @@ using TensorKit: ℙ
 
     for i in 1:length(ψ)
         @plansor difference[-1 -2; -3] := ψ.AL[i][-1 -2; 1] * ψ.C[i][1; -3] -
-                                          ψ.C[i-1][-1; 1] * ψ.AR[i][1 -2; -3]
+            ψ.C[i - 1][-1; 1] * ψ.AR[i][1 -2; -3]
         @test norm(difference, Inf) < tol * 10
 
         @test l_LL(ψ, i) * TransferMatrix(ψ.AL[i], ψ.AL[i]) ≈ l_LL(ψ, i + 1)

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/states/finitemps.jl	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/states/infinitemps.jl	46.32% <100.00%> (-31.62%)	⬇️
src/states/finitemps.jl	33.85% <0.00%> (-60.70%)	⬇️

... and 72 files with indirect coverage changes

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[lkdvos]

Except for the formatting issues, this looks great, thanks!
As a small FYI, I slightly screwed up the last PR so still have to fix some of the tests, so failures might actually be unrelate