feat: allow adding annotations to ServiceAccounts

[cawolf]

This PR fixes #425

Checklist

• [x] I have signed the CLA
• [x] I have updated/added any relevant documentation

Description

What's the goal of this PR?

This PR allows to add labels and annotations to ServiceAccounts created and managed by rbac-manager.

What changes did you make?

The changes include:

• an API extension to allow labels and annotations optionally
• parser and matcher changes to pass the metadata to the created objects

What alternative solution should we consider, if any?

-

[CLAassistant]

All committers have signed the CLA.

[cawolf]

@sudermanjr can you please reopen this PR and the issue #425 ?