Enable external data access on the metastore by terraform

[Sameh-Tawfik]

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Problem Statement The current implementation of the databricks metastore Terraform resources does not support the option of "external_access_enabled" check API link https://docs.databricks.com/api/workspace/metastores/update#external_access_enabled Proposed Solution Modify or create a new terraform resource in order to be able to enable or disable this option of "external_access_enabled"