Feature: view metrics refactor

[emhbrine]

• Added the Heatmap class in visuals/.
• The implementation of the view_metrics function was moved into view/metrics.py and now uses the Heatmap class for plotting.

[codecov]

Codecov Report

Merging #1056 (933b98d) into develop (dcbf231) will decrease coverage by 0.02%.
Report is 1 commits behind head on develop.
The diff coverage is 71.31%.

❗ Current head 933b98d differs from pull request most recent head 64ab800. Consider uploading reports for the commit 64ab800 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1056      +/-   ##
===========================================
- Coverage    65.33%   65.32%   -0.02%     
===========================================
  Files           45       48       +3     
  Lines         5083     5133      +50     
===========================================
+ Hits          3321     3353      +32     
- Misses        1762     1780      +18     

Files	Coverage Δ
macrosynergy/visuals/__init__.py	100.00% <100.00%> (ø)
macrosynergy/visuals/plotter.py	94.25% <100.00%> (+18.06%)	⬆️
macrosynergy/visuals/view/__init__.py	100.00% <100.00%> (ø)
macrosynergy/management/utils.py	90.62% <92.85%> (+0.17%)	⬆️
macrosynergy/panel/view_metrics.py	35.00% <66.66%> (-50.56%)	⬇️
macrosynergy/visuals/view/timelines.py	60.20% <50.00%> (ø)
macrosynergy/visuals/view/metrics.py	66.66% <66.66%> (ø)
macrosynergy/visuals/heatmap.py	65.45% <65.45%> (ø)

... and 1 file with indirect coverage changes