create a settings database

[VigneshVSV]

We have a JSON defined for the settings used in the app. See it here:

thing-control-panel/src/builtins/app-settings.tsx

Line 439 in c65e240

export type AppSettingsType = {

We want to be able to sync this settings into the database, per user, and load them upon sign in.

Rough Steps:

• Create a database table with keycloak-ID as primary key and settings JSON as a JSON field
• On change, make a post request if the user does not exist and make a patch request if a user has settings
• On sign in, load the settings with GET
• Add endpoints in open API specification for the above requests

blocked by #44 and #45