interrupt: introduce traits to manage interrupt sources

Introduce traits InterruptManager and Interrupt to manage
interrupt sources for virtual devices.

Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>
Signed-off-by: Bin Zha <zhabin@linux.alibaba.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: bonzini

Cargo.toml

@@ -6,3 +6,7 @@ repository = "https://github.com/rust-vmm/vm-device"
 license = "Apache-2.0"
 
 [dependencies]
+vmm-sys-util = "~0"
+
+[dev-dependencies]
+matches = ">=0"

coverage_config.json

@@ -1,5 +1,5 @@
 {
-  "coverage_score": 79.9,
+  "coverage_score": 76.3,
   "exclude_path": "",
   "crate_features": ""
 }