Fix metrics update

[aniketmaurya]

Changes

Metrics was reinitializing metrics instead of resetting values. Fixed with this PR.

Type of change

• [ ] 📚 Documentation Update
• [ ] 🧪 Tests Cases
• [x] 🐞 Bug fix (non-breaking change which fixes an issue)
• [ ] 🔬 New feature (non-breaking change which adds functionality)
• [ ] 🚨 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] 📝 This change requires a documentation update

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] Did you update CHANGELOG (docs/CHANGELOG.md) in case of a major change?

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #163 (ab1787a) into main (4f2418f) will not change coverage. The diff coverage is 80.00%.

@@           Coverage Diff           @@
##             main     #163   +/-   ##
=======================================
  Coverage   96.79%   96.79%           
=======================================
  Files          67       67           
  Lines        1965     1965           
=======================================
  Hits         1902     1902           
  Misses         63       63           

Flag	Coverage Δ
unittests	96.79% <80.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gradsflow/core/metrics.py	92.10% <80.00%> (ø)

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