Support IOTA Streams

[mathisonryan]

Are you willing to contribute it (Yes/No): Yes

Describe the feature and the current behavior/state.
IOTA MAM channels have been replaced by IOTA Stream channels, https://www.iota.org/solutions/streams. Since MAM will no longer be supported in the future, the agent should be updated to support IOTA streams.
Will this change the current API? How?
No
Who will benefit with this feature?
Anyone wanting to use iota channels in the future.
Miscellaneous Information