feat: add shared wildcard detector package (dnsx#924 1/2)

[Veirt]

Related to projectdiscovery/dnsx#924

Proposed changes

• extract the shared wildcard detection core from shuffledns into utils/dns/wildcard
• preserve the original wildcard permutation, cache flow, and explanatory comments from upstream while making lookups injectable for reuse across tools
• add RegistrableRoot so consumers can group wildcard detection per registrable domain
• add focused tests covering wildcard permutations, cache behavior, reprobes, current-host revalidation, transient probe errors, and registrable-root parsing

Proof

go test ./dns/wildcard -count=1

Output:

ok  	github.com/projectdiscovery/utils/dns/wildcard	0.008s

Checklist

• Pull request is created against the correct base branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[neo-by-projectdiscovery-dev]

Neo - PR Security Review

No security issues found

Highlights

• Adds shared wildcard detection package extracted from shuffledns with injectable DNS lookup mechanism
• Implements registrable domain parsing using golang.org/x/net/publicsuffix for TLD handling
• Includes comprehensive test coverage for wildcard permutations, caching, reprobing, and edge cases

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