Add support for additional params to send-message extension

[ericallam]

There are additional parameters that would be nice to be able to send through the send-message extension that aren't possible at the moment:

• scheduleType
• sendAt
• mediaUrl
• smartEncoded
• maxPrice

[NashIlli]

+1

[philnash]

Thanks for raising this and the support for it. I’m out at events this week, but I am planning to do some work on this repo next week and I should be able to get this added.

[NashIlli]

Thanks, @philnash :)