Add support for open-test-reporting format

Add a new parser for the open-test-reporting format developed by the
JUnit team (https://github.com/ota4j-team/open-test-reporting).

This format is a modern, framework-agnostic XML-based test reporting
standard that supports rich metadata including tags, attachments, and
infrastructure information.

Features:
- Auto-detection of both XML format variants:
  - Hierarchical format (h:execution) - tree-structured results
  - Event-based format (e:events) - streaming/real-time results
- ISO 8601 duration parsing (e.g., PT1.234S)
- Status mapping: SUCCESSFUL, SKIPPED, ABORTED, FAILED, ERRORED
- Error message extraction from failed tests
- Proper XML namespace handling

Files added:
- src/parsers/open-test-reporting/open-test-reporting-types.ts
- src/parsers/open-test-reporting/open-test-reporting-parser.ts
- __tests__/open-test-reporting.test.ts (20 tests)
- __tests__/fixtures/open-test-reporting/*.xml

src/main.ts

@@ -17,6 +17,7 @@ import {GolangJsonParser} from './parsers/golang-json/golang-json-parser'
 import {JavaJunitParser} from './parsers/java-junit/java-junit-parser'
 import {JestJunitParser} from './parsers/jest-junit/jest-junit-parser'
 import {MochaJsonParser} from './parsers/mocha-json/mocha-json-parser'
+import {OpenTestReportingParser} from './parsers/open-test-reporting/open-test-reporting-parser'
 import {PythonXunitParser} from './parsers/python-xunit/python-xunit-parser'
 import {RspecJsonParser} from './parsers/rspec-json/rspec-json-parser'
 import {SwiftXunitParser} from './parsers/swift-xunit/swift-xunit-parser'
@@ -271,6 +272,8 @@ class TestReporter {
         return new JestJunitParser(options)
       case 'mocha-json':
         return new MochaJsonParser(options)
+      case 'open-test-reporting':
+        return new OpenTestReportingParser(options)
       case 'python-xunit':
         return new PythonXunitParser(options)
       case 'rspec-json':