Initialize required Klasses on Kustomer upon app initialization

[nirebu]

To create custom KObjects in Kustomer we first need to have available their Klasses in order to have their endpoints available. Looks like the endpoint is reachable with the singular and plural Klass name, although Kustomer documentation doesn't specify that.

Hitting a non existent Klass will result in a 404.

e. g. To have available the route klasses/orders we first need to create the order klass.

[stale]

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