Vulnerability History - extend to history of severities

[siewer]

As is

Currently vulnerability trend chart is generated based on records in VulnHistory table.

This table is generated based on scheduler in GlobalScheduler.createHistoryForVulns()

to be

VulnHistory table to be extended -> to contain information about severities
e.g.: codeVulnHistory to -> codeVulnHistory, codeVulnCriticalHistory, codeVulnHighHistory, codeVulnMediumHistory, codeVulnLowHistory (where codeVulnHistory = codeVulnCriticalHistory+codeVulnHighHistory+codeVulnMediumHistory+codeVulnLowHistory)

note: it is important that the overall (e.g. codeVulnHistory) still exists as it is used in many places by the frontend.

Additional: new API Endpoint that will print history for project with severities has to be created

To do

• Create new columns in VulnHistory table (via changelog)
• Modify createVulnHistoryService.createScheduled(project) to populate new columns
• Create API endpoint in ProjectRestController that show history for project including information about severities
• Create tests for newly created methods