Incompatible APIs with jsii@5

[iliapolo]

Upgrading to jsii v5 revealed a few APIs that are now incompatible.

• https://github.com/cdk8s-team/cdk8s-core/blob/843e3018dc3b614a5fbac0a83739acff52edf269/src/api-object.ts#L33
• https://github.com/cdk8s-team/cdk8s-core/blob/843e3018dc3b614a5fbac0a83739acff52edf269/src/metadata.ts#L100

error JSII1999: Index signatures are not supported in jsii APIs. This declaration must be marked "@internal" or "@jsii ignore".

33   readonly [key: string]: any;

This makes sense, as these APIs are actually not representable in Java/Golang - which means they are indeed broken right now. Since addressing this is a breaking change - this needs to be done carefully.

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This is :bug: Bug Report