Improve updatable heap - [MOD-5439]

[GuyAv46]

Describe the changes in the pull request

Replacing the valueToPriority unordered map of the updatable heap with valueToNode.

Instead of having a multimap from priority to values, and an unordered map from value to priority, we will have the same multimap, but with a map from value to its node in the multimap. This way we have less lookup work to do when updating a value's priority.

Additional changes:

1. Replacing empty destructors with default (good practice)
2. Simplifying formatting script

Mark if applicable

• This PR introduces API changes
• This PR introduces serialization changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (182b87a) to head (4d3df4e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
==========================================
- Coverage   95.37%   95.37%   -0.01%     
==========================================
  Files          66       66              
  Lines        4151     4148       -3     
==========================================
- Hits         3959     3956       -3     
  Misses        192      192              

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