Publish IJ plugin

[alecthomas]

We'll need this available to users before they're onboarded.

[alecthomas]

Blocked on initial manual upload to Block account. Waiting for OSPO.

[alecthomas]

OSPO added me!

Next blocker, waiting on JetBrains to approve the plugin:

[alecthomas]

Okay, the IJ plugin did get rejected for using internal API's, so it will need a lot of work to fix that. Parked for now.