perf: optimize rule engine with Flow-based lazy evaluation

[tangcent]

• Replace Sequence with Flow for suspend function compatibility
• Enable early termination in aggregation modes (SINGLE, ANY, IntRuleMode)
• Add AnyKit utilities for lenient type conversion (asInt, asBoolean)
• Properly handle CancellationException for Flow exception transparency
• Add comprehensive documentation to RuleModes and AnyKit

This addresses performance issues by:

• Short-circuiting rule evaluation when terminal operators find satisfying results
• Avoiding eager collection of all rule results when only first is needed

Closes #669

[github-actions]

📦 Plugin has been packaged for this PR. You can download easy-api-3.0.5.252.0.zip from the GitHub Actions workflow run by clicking on the "Artifacts" dropdown.

[codecov]

Codecov Report

❌ Patch coverage is 81.00000% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.910%. Comparing base (ccf01ca) to head (0111c02).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ain/kotlin/com/itangcent/easyapi/rule/RuleModes.kt	60.000%	8 Missing and 2 partials ⚠️
...in/com/itangcent/easyapi/rule/engine/RuleEngine.kt	84.783%	4 Missing and 3 partials ⚠️
...c/main/kotlin/com/itangcent/easyapi/util/AnyKit.kt	92.308%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##              master      #677       +/-   ##
===============================================
+ Coverage     53.874%   53.910%   +0.036%     
+ Complexity      2382      2375        -7     
===============================================
  Files            231       232        +1     
  Lines          13591     13582        -9     
  Branches        3070      3067        -3     
===============================================
  Hits            7322      7322               
+ Misses          4911      4910        -1     
+ Partials        1358      1350        -8     

Flag	Coverage Δ
unittests	53.910% <81.000%> (+0.036%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../main/kotlin/com/itangcent/easyapi/rule/RuleKey.kt	75.000% <100.000%> (ø)
...c/main/kotlin/com/itangcent/easyapi/util/AnyKit.kt	92.308% <92.308%> (ø)
...in/com/itangcent/easyapi/rule/engine/RuleEngine.kt	83.562% <84.783%> (+13.483%)	⬆️
...ain/kotlin/com/itangcent/easyapi/rule/RuleModes.kt	71.429% <60.000%> (-16.071%)	⬇️

... and 4 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ccf01ca...0111c02. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.