various fixes

[GTorlai]

This PR implemented the following changes:

• Change definition of Rz/CRz rotations, added CPHASE gate and P(phi) gate #254
• Fix an issue in building the Choi matrix, where it was only possible to build the Choi matrix for a unitary circuit and a noise model as input parameters, while not for a circuit data structure already containing tuples for Kraus operators.
• Fix observer time keeping in tomography
• Added expect for ITensor

[codecov-commenter]

Codecov Report

Merging #256 (5d5a1b7) into master (7848bf5) will increase coverage by 1.85%. The diff coverage is 65.47%.

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   84.22%   86.07%   +1.85%     
==========================================
  Files          24       24              
  Lines        2523     2478      -45     
==========================================
+ Hits         2125     2133       +8     
+ Misses        398      345      -53     

Impacted Files	Coverage Δ
src/PastaQ.jl	100.00% <ø> (ø)
src/measurements.jl	0.00% <0.00%> (ø)
src/tomography/quantumtomography.jl	84.67% <0.00%> (-0.73%)	:arrow_down:
src/circuits/gates.jl	79.68% <37.50%> (-1.70%)	:arrow_down:
src/circuits/runcircuit.jl	85.47% <96.29%> (+1.21%)	:arrow_up:

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