fix: msdsn improvements for TrustServerCertificate and IPv6

[dlevy-msft-sql]

Two independent fixes to the msdsn package:

Changes

1. TrustServerCertificate Field

Adds TrustServerCertificate boolean field to msdsn.Config struct, making this important connection parameter accessible to callers.

2. IPv6 URL Generation Fix

Fixes Config.URL() to properly bracket IPv6 addresses in generated URLs, preventing malformed URLs like sqlserver://user@::1:1433 (now correctly generates sqlserver://user@[::1]:1433).

---

Split from #306 for easier review

[Copilot]

Pull request overview

This PR provides two independent improvements to the msdsn package: adding a TrustServerCertificate field to the Config struct and fixing IPv6 address formatting in generated URLs.

Changes:

• Adds TrustServerCertificate boolean field to Config struct to expose this connection parameter to callers
• Fixes Config.URL() to properly bracket IPv6 addresses when combined with ports (e.g., [::1]:1433 instead of ::1:1433)
• Updates parseTLS function signature to return the trustServerCert value for storage in Config

[Copilot]

Pull request overview

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

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.59%. Comparing base (c16a19e) to head (2fcbb73).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
+ Coverage   75.36%   78.59%   +3.23%     
==========================================
  Files          34       34              
  Lines        6597     6598       +1     
==========================================
+ Hits         4972     5186     +214     
+ Misses       1337     1134     -203     
+ Partials      288      278      -10     

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