dns: support IPv6-only and IPv4-only in setLocalAddress()

[mohiuddin-khan-shiam]

What was fixed

Resolver.prototype.setLocalAddress(ipv4, ipv6) incorrectly required an IPv4 string even when callers only wanted to set an IPv6 local address.
Calling resolver.setLocalAddress(undefined, '::1') threw ERR_INVALID_ARG_TYPE, breaking the documented API and blocking IPv6-only use-cases.

Changes

• lib/internal/dns/utils.js
  • Added ERR_MISSING_ARGS to imported error codes.
  • Re-implemented argument validation:
    • Now validates each address only when provided.
    • Throws ERR_MISSING_ARGS('ipv4','ipv6') when both arguments are omitted.
  • Keeps snapshot state logic unchanged.

Impact

Restores conformance with public documentation:

• Users can bind a resolver to IPv6 only, IPv4 only, or both.
• No breaking change for existing valid code; previously invalid calls now work as intended.

Refs: documentation for resolver.setLocalAddress

[nodejs-github-bot]

Review requested:

• [ ] @nodejs/net

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.14%. Comparing base (bba07d7) to head (5858af6). Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #58701      +/-   ##
==========================================
- Coverage   90.17%   90.14%   -0.03%     
==========================================
  Files         637      637              
  Lines      188023   188029       +6     
  Branches    36887    36889       +2     
==========================================
- Hits       169552   169505      -47     
- Misses      11223    11276      +53     
  Partials     7248     7248              

Files with missing lines	Coverage Δ
lib/internal/dns/utils.js	99.45% <100.00%> (+<0.01%)	:arrow_up:

... and 32 files with indirect coverage changes

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