Add methods to check for size and empty collections

[uhafner]

Provides some new checks like:

Ensure.that(new String[]{""}).hasSize(1);
Ensure.that(new String[0]).isEmpty();
Ensure.that(new String[]{""}).isNotEmpty();

Ensure.that(Set.of("")).hasSize(1);
Ensure.that(Set.of()).isEmpty();
Ensure.that(Set.of("")).isNotEmpty();

[github-actions]

☀️   Quality Monitor

Tests

     Unit Tests: ✅ successful — 87 passed, 2 skipped
   ⛔   Architecture Tests: ✅ successful — 17 passed, 2 skipped

Coverage for New Code

   〰️   Line Coverage: 87.50% — 6 missed lines
   ➰   Branch Coverage: 94.44% — 1 missed branches
     Mutation Coverage: 79.31% — 6 survived mutations
   💪   Test Strength: 100.00% — perfect 🎉

Coverage for Whole Project

   〰️   Line Coverage: 92.03% — 64 missed lines
   ➰   Branch Coverage: 92.04% — 18 missed branches
     Mutation Coverage: 91.16% — 29 survived mutations
   💪   Test Strength: 93.15% — 22 survived mutations in tested code

Style

     CheckStyle: No warnings
     PMD: No warnings
   ☕   Java Compiler: No warnings

Bugs

     SpotBugs: No bugs
   🐛   Error Prone: No bugs

API Problems

   🚫   Revapi: 8 warnings — low: 8

Vulnerabilities

   🛡️   OWASP Dependency Check: No vulnerabilities

Software Metrics

   🌀   Cyclomatic Complexity: 397 (total)
   💭   Cognitive Complexity: 173 (total)
   ➿   N-Path Complexity: 361 (total)
   📏   Lines of Code: 4722 (total)
   📝   Non Commenting Source Statements: 1338 (total)
   🔗   Class Cohesion: 71.43% (maximum)
   ⚖️   Weight of Class: 100.00% (maximum)

🚦 Quality Gates

Overall Status: ❗ UNSTABLE

✅ Passed Gates

• ✅ Overall Tests Success Rate: 100.00 >= 100.00
• ✅ Branch Coverage in New Code: 94.44 >= 90.00
• ✅ Potential Bugs in Whole Project: 0.00 <= 0.00
• ✅ Style Violation in Whole Project: 0.00 <= 0.00

❌ Failed Gates

• ❌ Line Coverage in New Code: 87.50 >= 90.00
• ❌ Mutation Coverage in New Code: 79.31 >= 90.00

---

Created by Quality Monitor v4.10.0 (#a182a22). More details are shown in the GitHub Checks Result.