Allow deleting links between lambdas and applications

[rideam]

• updated lambdaConfiguration to allow for null

[mooreds]

Unfortunately this code is generated here: https://github.com/FusionAuth/fusionauth-client-builder/blob/master/src/main/client/typescript.client.ftl and here https://github.com/FusionAuth/fusionauth-client-builder/blob/master/src/main/domain/io.fusionauth.domain.Application%24LambdaConfiguration.json

https://github.com/FusionAuth/fusionauth-client-builder/blob/master/src/main/domain/io.fusionauth.domain.Application%24LambdaConfiguration.json is auto generated from java code.

So we can't just make changes to this project.

[rideam]

Closing this, found a way to handle unlinking in the cli without this change

[mooreds]

See FusionAuth/fusionauth-node-cli#8 (comment) for the workaround (setting the lambda id property to the empty string).