[Bouncy Castle] include bc into pulsar-client fix docs (#8491)

### Motivation
The docs of bc need an update after merge PR #7453, also we could include bc in the pulsar client to avoid reference it in other modules.

### Modifications

- fix the docs after fix PR 7453;
- make pulsar client include bc module; avoid other modules to include bc.
- fix the pulsar-function bc jar issue.

### Verifying this change
all the tests passed.
2 files changed
tree: 53747e063fc6f098ffe49af118499f6ce5fab656
  1. pulsar-io/