EventSource deployment strategy and replicas control

[whynowy]

Is your feature request related to a problem? Please describe.
The default EventSource deployment strategy is rollingUpdate, it works for most of event sources, but doesn't for the ones who do not allow multiple clients running at the same time, for example, multiple NATS clients with same client ID are not allowed.

Same problem applies for replicas.

Describe the solution you'd like
For the eventsources like that,

1. use recreate strategy;
2. replicas always set to 1.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.