feat: added cbr support

[Khuzaima05]

Description

Added CBR support

Git-issue

https://github.ibm.com/GoldenEye/issues/issues/4833

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[ocofaigh]

Please update the examples/complete/README.md file. Update the title to Complete example with BYOK encryption and CBR rules and also add a bullet point saying:

• A context-based restriction (CBR) rule to only allow Event Streams to be accessible from within the VPC.

[Khuzaima05]

@ocofaigh Getting this error CreateRuleWithContext failed Invalid API type 'crn:v1:bluemix:public:context-based-restrictions::::api-type:data-plane'. Service 'messagehub' does not support any API type. So should i remove the API type?
As there is no scope to API in event stream service named "messagehub" according to https://cloud.ibm.com/docs/account?topic=account-context-restrictions-whatis#cbr-adopters

[ocofaigh]

@jojustin could you please advise on above? ^

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.2.0 🎉

The release is available on GitHub release

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