add rate limits handling to retry user email search

[harryabbott]

as title.
running into rate limit issues when getting hundreds of users userIDs from their email during TF plans. please feel free to change/fix as you see fit.

[der-eismann]

@pablovarela is this project dead or could you see yourself merging this in the near future? Would be very important for us to have.

[smoya]

@pablovarela is this project dead or could you see yourself merging this in the near future? Would be very important for us to have.

Rate limits are a general thing. For example, I'm being hit by it when creating/updating user groups. There was a fix in a PR, but got stale... #72

[ElliotG]

@smoya / @der-eismann --> I've forked the repo for now, and I just pushed v1.2.3 that addresses rate limiting for user groups. I used a slightly different pattern than in this PR, but if @harryabbott is interested, submit a PR there, i'll merge and cut v1.2.4.

https://registry.terraform.io/providers/ElliotG/slack/latest

And for Pablo, i'm happy to merge this back into your code base if you end up picking up this project again.

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[smoya]

ping @pablovarela ⬆️