v0.2.0

Changes

• Merge pull request #27 from arceos-hypervisor/lic (eeeba2c)
• chore(release): bump version to 0.2.0 (efdb499)
• refactor: relicense to Apache-2.0 (d8ad31b)
• Merge pull request #26 from arceos-hypervisor/ci (658dbf4)
• refactor: apply formatting and clean up code style (379d2c0)
• ci: refactor workflows for modular CI/CD pipeline (50211e5)
• ci: refactor workflows for modular CI/CD pipeline (8cd418c)
• Fix bugs and support axvisor to run 2 vms (#25) (dda3b4a)