Add function correlation_dynamic

[zejian-li]

Add function for computing two-time correlations for time-dependent master equation.

[ChristophHotter]

Seems okay for me.
@zejian-li Could you please also add a test to the file test_timecorrelations.jl?

[zejian-li]

Seems okay for me. @zejian-li Could you please also add a test to the file test_timecorrelations.jl?

Ok I haved added some tests based on the the existing ones for timecorrelations.correlation and verified locally that they would pass.

[codecov]

Codecov Report

Merging #325 (0993ebb) into master (3d0499c) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
+ Coverage   98.24%   98.27%   +0.02%     
==========================================
  Files          16       16              
  Lines        1310     1331      +21     
==========================================
+ Hits         1287     1308      +21     
  Misses         23       23              

Impacted Files	Coverage Δ
src/timecorrelations.jl	100.00% <100.00%> (ø)
src/mcwf.jl	100.00% <0.00%> (ø)
src/master.jl	100.00% <0.00%> (ø)
src/timeevolution_base.jl	100.00% <0.00%> (ø)
src/stochastic_schroedinger.jl	100.00% <0.00%> (ø)
src/stochastic_master.jl	97.26% <0.00%> (+0.07%)	⬆️
src/bloch_redfield_master.jl	93.50% <0.00%> (+0.08%)	⬆️
src/semiclassical.jl	96.84% <0.00%> (+0.10%)	⬆️
src/schroedinger.jl	89.65% <0.00%> (+0.76%)	⬆️

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[ChristophHotter]

correlation_dynamic() is now in the master branch.
It is available in version 1.0.2