Add endpoint to list AWS Security Groups

[zreigz]

What this PR does / why we need it: Add endpoint to list AWS Security Groups

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #6330

Add endpoint to list AWS Security Groups: GET /api/v1/providers/aws/{dc}/securitygroups

[zreigz]

/retest

[zreigz]

/retest

[lsviben]

/approve
/lgtm

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 57de4be9dd7b1732d521be30b0d301df6a429322

[moelsayed]

/approve

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lsviben, moelsayed, zreigz

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• OWNERS [lsviben,moelsayed,zreigz]
• cmd/kubermatic-api/OWNERS [lsviben,zreigz]
• pkg/api/OWNERS [lsviben,zreigz]
• pkg/handler/OWNERS [lsviben,zreigz]
• pkg/provider/cloud/OWNERS [moelsayed]

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[moelsayed]

/lgtm

[kubermatic-triage-bot]

/retest
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[kubermatic-bot]

@kubermatic-triage-bot:

In response to this:

/retest
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Review the full test history

Silence the bot with an /lgtm cancel or /hold comment for consistent failures.

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