API endpoint for checking mailbox status

Implement an API endpoint at /status that just returns 200 OK. This can replace the existing endpoint at /.

changed milestone to %Mailbox

added Mailbox Sponsor 6 T: task Weight: 1 labels

mentioned in issue briar#2170 (closed)

marked this issue as related to briar#2170 (closed)

assigned to @sebkur

The endpoint should require authentication as the owner, as it's meant to be used to check that the owner can connect and authenticate to the mailbox, as well as for checking the mailbox's status.

mentioned in merge request !38 (merged)

added S: in progress label

added S: in code review label and removed S: in progress label

mentioned in commit 4f7feec4

closed with merge request !38 (merged)

removed the relation with briar#2170 (closed)

mentioned in issue briar#2207 (closed)

marked this issue as related to briar#2207 (closed)

removed S: in code review label

added Mailbox app label

added R: fixed label