fix: add vocalization for each message

[SputNikPlop]

This should resolve #1152 though needs to be tested.

[jessielw]

I think this is what @kevmo314 was referring to @SputNikPlop.

Can you take a look at the changes I just added to #1162 and let me know if it looks like this is going down the correct path?

Note: I didn't modify the changes made to message.dart

[jessielw]

@kevmo314 can you take a look at the latest changes and let me know how things are looking?

[kevmo314]

Looks good just two minor comments.

[kevmo314]

This looks good. For testing, try adding a button that starts the service and set the tts channel. You should hear it vocalize messages out of that channel.

[jessielw]

Tested it out, seems to be working properly