Update param_reconfig_response to RFC 6525

[philipch07]

Description

• Updates param_reconfig_response to conform to RFC 6525 since it just needed some optional fields
• Adds tests to ensure that it's correct

Reference issue

Resolves #418.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.94%. Comparing base (a69c6a2) to head (898ffcd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   83.84%   83.94%   +0.10%     
==========================================
  Files          51       51              
  Lines        3448     3470      +22     
==========================================
+ Hits         2891     2913      +22     
  Misses        417      417              
  Partials      140      140              

Flag	Coverage Δ
go	83.94% <100.00%> (+0.10%)	⬆️

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[Copilot]

Pull Request Overview

This PR adds support for optional fields in SCTP reconfiguration response parameters according to RFC 6525. The implementation now handles the optional Sender's Next TSN and Receiver's Next TSN fields that were previously not supported.

• Added support for optional senderNextTSN and receiverNextTSN fields in paramReconfigResponse
• Implemented marshaling and unmarshaling logic to handle variable-length parameter values (8, 12, or 16 bytes)
• Added validation to ensure receiverNextTSN is only present when senderNextTSN is present

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
param_reconfig_response.go	Extended struct with optional fields, updated marshal/unmarshal to handle variable lengths, added validation and new error types
param_reconfig_response_test.go	Added comprehensive tests for optional fields including roundtrip tests, validation tests, and renamed existing test function

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