[terraform-ibm-icd-postgresql] Expose ability to create read-only-replicas in DA

[iamar7]

Description

Expose the variable remote_leader_crn in the DA to create read only replica. Further, add it in the catalog.json

New or affected modules

terraform-ibm-icd-postgresql

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[terraform-ibm-modules-ops]

🎉 This issue has been resolved in version 3.21.0 🎉

The release is available on:

• GitHub release
• v3.21.0

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