fix(core-p2p): Ensure peer port is always an integer to avoid socket validation errors

[bertiespell]

Summary

Ensures that the port number used to construct the Peer class always uses an integer (instead of a string). This requires converting a string that may be set from config or environment variables.

This fixes the socket data validation issues. As per #3860

The change is implemented by using a Number() conversion on string config.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3864 into develop will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #3864   +/-   ##
========================================
  Coverage    92.09%   92.09%           
========================================
  Files          620      620           
  Lines        14845    14845           
  Branches      1847     1847           
========================================
  Hits         13671    13671           
  Misses         951      951           
  Partials       223      223           

Flag	Coverage Δ
#functional	6.10% <0.00%> (ø)
#integration	9.56% <0.00%> (ø)
#unit	90.12% <100.00%> (ø)

Impacted Files	Coverage Δ
...es/core-p2p/src/socket-server/utils/get-headers.ts	100.00% <ø> (ø)
packages/core-p2p/src/service-provider.ts	100.00% <100.00%> (ø)

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