lighten docker images

**Is your feature request related to a problem? Please describe.**
It's not a problem but just a question, why use image apachepulsar/pulsar:tag and not apachepulsar/pulsar-all:tag ?

Indeed the size of apachepulsar/pulsar-all:tag it's to 3gb and apachepulsar/pulsar:tag it's 446Mb ? What is in terms of storage and downloading would be more interesting.

I imagine that some binary are missing in the lightened image. But I see that there is also a 2gb /pulsar/connectors directory in the apachepulsar/pulsar-all:tag image.