Add SecurityMetricsType to ProjectType

Subashis Chakrabortyrequested to merge
555479-project-metrics into master

This MR adds SecurityMetricsType for project. This is the first part. In the next MR the necessary change for project level in VulnerabilitiesOverTimeResolver will be done. This is under FF.

Related to #555479 (closed)

Edited by Subashis Chakraborty

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