v0.2.1 - INT8 support

What's Changed

• Add C wire ABI and streamline submission admission by @SnowCheetos in #70
• Reuse OpenVINO warm-path metadata safely by @SnowCheetos in #71
• Add exact INT8 execution tiers by @SnowCheetos in #72

Full Changelog: v0.2.0...v0.2.1