[Feature] Support for CCS API key management

[flaneur23]

Is your feature request related to a problem? Please describe.
We are using CCS heavily in our environment. There is almost no support for this feature in the provider.
Among other things mainly I mean CCS API key management.
This functionality is no longer in beta (from 8.14 it is GA).

Describe the resource you would like to have implemented.
The resource similiar to elasticstack_elasticsearch_security_api_key, but covering Create Cross-Cluster API key and Update Cross-Cluster API key functionalities.

Describe the solution you'd like
Refer to previous section.

Describe alternatives you've considered
We are using custom API calls, but it isn't working very well with different Terraform flows (create, update, destroy). It is considered a technical debt.

Additional context
It is no such complex topic.

[tobio]

Fixed by #1252

[tobio]

@flaneur23 support for creating cross cluster API keys will be available in the next provider release which should be in the next few weeks.