[FEAT] Allow users to add required capabilities

[AlonZivony]

Prerequisites

• [ ] This issue is an EPIC issue (add label: EPIC).
• [ ] This issue is an EPIC TASK (add issue to EPIC description).

Select one OR another:

• [x] I'll create a PR to implement this feature (assign to yourself).
• [ ] Someone else should implement this (describe it well).

Feature description

Currently, we have many capabilities bug because of the capabilities dropping functionality. We do our best effort to solve them as quickly as we can, but some of them are hard to solve permanently quickly. To allow users bypass these bugs while we solve them, we can expose an API to add some capabilities to the required set (aka, capabilities to keep when dropping capabilities).