[Helm] Improve custom namespace options

[toddbaert]

The Helm chart allows the definition of a custom default namespace where all OFO's resources will be created. Some improvements are needed here to support more use-cases.

We should:

• Add the ability to customize the namespace in use by OFO, without actually creating it.
• Add the ability to add additional labels and annotations to the created namespace.

[toddbaert]

cc @cpitstick-latai

[7h3-3mp7y-m4n]

Hey I would like to take this issue
/assign

[toddbaert]

OK @7h3-3mp7y-m4n ! Keep us up to date with your progress.

[7h3-3mp7y-m4n]

thank you, I'll keep you updated on Slack