[BUG] Slack Terraform CI automation timeouts

[smoya]

Describe the bug.

@Shurtu-gal did an excellent job with automating the creation and maintainability of AsyncAPI Slack channels and user groups. See https://github.com/asyncapi/community/issues/1072

However, we faced a blocker issue that makes the Terraform manifest to fail due to timeouts requesting Slack API.

The TF provider is not optimized at all. I have the feeling this code is being executed per each managed Usergroup whenever TF wants to refresh its state: https://github.com/pablovarela/terraform-provider-slack/blob/master/slack/resource_usergroup.go#L108-L128, so potentially we are calling the usergroups.list API method on each usergroup we have.

Expected behavior

I believe we could do some work on the provider repo (it's written in go, seems easy to read and understand at a glance) so we can implement some caching or whatever mechanism we decide. But in short term, I can't see how to fix it.

Screenshots

How to Reproduce

terraform apply with the proper Slack Token configured (ask @derberg or me)

🥦 Browser

None

👀 Have you checked for similar open issues?

• [X] I checked and didn't find similar issue

🏢 Have you read the Contributing Guidelines?

• [X] I have read the Contributing Guidelines

Are you willing to work on this issue ?

None