[FEATURE] add issue template to allow contributors choose which type of issue they want to report

[adity1raut]

Description

• add issue template to allow contributors choose which type of issue they want to report(e.g., bug or feature request),

• Bug Report Template (bug_report.yaml)

  • Captures detailed bug information including reproduction steps
  • Includes volcano-global and Karmada version tracking
  • Collects multi-cluster environment details for better debugging
  • Gathers deployment type and cluster topology information

• Enhancement/Feature Request Template (enhancement.yaml)

  • Categorizes feature requests by component area
  • Tracks impact scope across different system components
  • Ensures documentation updates are considered
  • Captures multi-cluster and integration use cases

[adity1raut]

/cc @Monokaix , @kevin-wangzefeng