Avoid repeating provider aliases across child modules

[kietay]

Currently passing a large map of providers (15 regions) - to a module, would be nice to use a local map rather than actually paste this under each module invocation:

  providers = {
    "aws.ap-northeast-1" = "aws.ap-northeast-1"
    "aws.ap-northeast-2" = "aws.ap-northeast-2"
    "aws.ap-southeast-1" = "aws.ap-southeast-1"
    "aws.ap-southeast-2" = "aws.ap-southeast-2"
    "aws.ap-south-1"     = "aws.ap-south-1"
    "aws.ca-central-1"   = "aws.ca-central-1"
    "aws.eu-central-1"   = "aws.eu-central-1"
    "aws.eu-west-1"      = "aws.eu-west-1"
    "aws.eu-west-2"      = "aws.eu-west-2"
    "aws.eu-west-3"      = "aws.eu-west-3"
    "aws.sa-east-1"      = "aws.sa-east-1"
    "aws.us-east-1"      = "aws.us-east-1"
    "aws.us-east-2"      = "aws.us-east-2"
    "aws.us-west-1"      = "aws.us-west-1"
    "aws.us-west-2"      = "aws.us-west-2"
  }

Originally posted by @arehmandev in #17402 (comment)

Or just being able to implicitly pass provider aliases to child modules would also do the trick.

[jbardin]

Hi @kietay,

Thanks for filing the request. This would be covered by the use case presented in #25244, so we can follow any feature development there.

Thanks!

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