Review size of devtools app.

[elmasse]

Some findings:

• We are including the entire @dxos/credentials package just to get access to keyTypeName. Need better module resolution to help tree-shaking.
• Remove Moment.

[elmasse]

[elmasse]

Shaving bites. So far down from 9.5Mb to 5.19Mb by changing these:

credentials (major offender):

• import { keyTypeName } from '@dxos/credentials/dist/es/keys/keytype';

react-ux:

• import JsonTreeView from '@dxos/react-ux/dist/es/components/JsonTreeView';