WoC Broadcaster Network Param

[msinkec]

Should take in testnet as in the Network enum under the constants module.

While at it, set type each network param in the SDK to the Network enum. Also update the tests to use the enum instead of passing a hard-coded string.

[sirdeggen]

Unassigned due to inactivity.

[ALiberalVoluntarist]

@sirdeggen Let me dig in to the issue.

[ALiberalVoluntarist]

Successfully improved the code function.