Implement `memoryLimit` field under `DevfileRegistry` CRD

[michael-valdron]

Which area/kind this issue is related to?

/area registry

Issue Description

The additional of the memoryLimit field for overriding the default memory limit of containers created using DevfileRegistry registry operator CRD would match the same feature available under the devfile registry helm chart: https://github.com/devfile/registry-support/blob/f66264f22310c3c93bf0c77db5f4cd4b560aba5e/deploy/chart/devfile-registry/values.yaml#L29

Parent Epic: #1274

Acceptance Criteria

• Implement memoryLimit resource field for index server
• Implement memoryLimit resource field for registry viewer
• Implement memoryLimit resource field for OCI server
• Create test case to set memoryLimit fields
• Run integration tests to verify changes