[feat](pulsar): support the subscription mode in PubSub Pulsar fields.

[ericsyh]

Describe the feature

Pulsar's subscription supports two kinds of modes: durable and non-durable: https://pulsar.apache.org/docs/next/concepts-messaging/#what-is-a-subscription-mode, most cases and by default the subscription is using the durable mode.

But some case like consuming message but won't change the topic cursor, Pulsar suggests to use a special client called the Reader, and for Dapr users if they want to create a Pulsar reader to use the straightforward way is to create a non-durable subscription.

And this issue wants to support subscription mode on Dapr PubSub Pulsar's fields.

Release Note

RELEASE NOTE:

ADD a new field subscription mode on Dapr PubSub Pulsar

[darraghjones]

great...i was just about to request this feature :)