Dispatch progress bar method in EnsembleProblems

[albertomercurio]

Checklist

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Description

This PR fixes the little performance decrease introduced with PR #254.

Here I use multiple dispatch to either use a RemoteChannel or not to handle the progress bar, depending on the ensemble_method. In this way, we support the best performances of multithreading cases, and also support the progress_bar for Distributed computing in clusters.

[codecov]

Codecov Report

Attention: Patch coverage is 62.19512% with 31 lines in your changes missing coverage. Please review.

Project coverage is 92.30%. Comparing base (2f92e5b) to head (863d7ec).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/time_evolution/ssesolve.jl	58.97%	16 Missing ⚠️
src/time_evolution/mcsolve.jl	63.41%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
- Coverage   94.38%   92.30%   -2.08%     
==========================================
  Files          31       31              
  Lines        2297     2327      +30     
==========================================
- Hits         2168     2148      -20     
- Misses        129      179      +50     

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[ytdHuang]

LGTM!