Provide workspaces.annotations field in DWOC for all devworkspaces

[dkwon17]

Description

There is no way to add annotations to all workspaces in the DWOC

My proposal is to add config.workspaces.annotations field in DWOC that allows setting annotations to add to a devworkspace's pod.

Additional context

This feature would help implement:

• https://issues.redhat.com/browse/CRW-6550
• https://github.com/eclipse-che/che/issues/22809

[AObuchow]

Resolved in https://github.com/devfile/devworkspace-operator/pull/1271