add support integration for OSv framework

[kartikangiras]

Description

Complete OSv implementation following the unikernel interface

• Supports QEMU as the monitor/VMM
• Handles network configuration via --ip --netmask, and --defaultgw flags
• Supports block devices using virtio-blk
• Supports ZFS filesystem (OSv's built-in filesystem)
• Passes environment variables using --env flags
• Constructs proper command strings for OSv boot parameters

Issue

#103

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