feat(CVE): add CVE severity counters to returned images and CVE list calls (#2131)

For CLI output is similar to:

CRITICAL 0, HIGH 1, MEDIUM 1, LOW 0, UNKNOWN 0, TOTAL 2

ID                SEVERITY  TITLE
CVE-2023-0464     HIGH      openssl: Denial of service by excessive resou...
CVE-2023-0465     MEDIUM    openssl: Invalid certificate policies in leaf...

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

pkg/common/model.go

@@ -84,8 +84,13 @@ type Platform struct {
 }
 
 type ImageVulnerabilitySummary struct {
-	MaxSeverity string `json:"maxSeverity"`
-	Count       int    `json:"count"`
+	MaxSeverity   string `json:"maxSeverity"`
+	UnknownCount  int    `json:"unknownCount"`
+	LowCount      int    `json:"lowCount"`
+	MediumCount   int    `json:"mediumCount"`
+	HighCount     int    `json:"highCount"`
+	CriticalCount int    `json:"criticalCount"`
+	Count         int    `json:"count"`
 }
 
 type LayerSummary struct {