Add option to import existing Timescale service by providing password (or provide a password during service creation)

[dennisameling]

We're currently in the process of importing our existing Timescale databases into Terraform, as they were created manually a long time ago. As part of this, we get the password from the timescale_service resource and store it as a secret in AWS.

However, since these Timescale databases already existed and we're just trying to import them, the password value in the generated secret is null.

In your docs, you mention that the password is a one-time generated value:

It would be great if we could just provide a password ourselves to the timescale_service resource, which would also allow for password rotation (without recreating the entire DB instance). Would that be an option at all?

For reference, AWS DB instances also support providing a password yourself when creating an instance through Terraform.