Allow interactions via DM

[kauffj]

As a Twitter user, it feels awkward for me to make public tweets to check my balance or get a deposit address. I would prefer to communicate via direct message.

[filipnyquist]

As per https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/migration/introduction, Twitter is now moving DM support into paid plans, which means we would need to pay $339/month. The question I have is if DM support is worth that much per month.

[filipnyquist]

This also creates problems for #13

[alyssaoc]

validate the demand and investigate alternate approaches

[nikooo777]

I will take a quick look at the feasibility of this on my next sprint and decide whether this is still a valid issue.