Add support for provider attribute

[shiimaxx]

When configured for override default provider in aws_s3_bucket resource block, should add the same provider attribute to each standalone resource.

[shiimaxx]

The issue of background for this PR:

Terraform can override the default provider with the provider attribute in the resource block.

e.g.

resource "aws_s3_bucket" "example-bucket" {
  bucket   = "example-bucket"
  provider = aws.us-east-1

  versioning {
    enabled = true
  }
}

In the above, tfrefactor will migrate from the versioning attribute to the aws_s3_bucket_versioning resource but the provider attribute is ignored.

resource "aws_s3_bucket" "example-bucket" {
  bucket   = "example-bucket"
  provider = aws.us-east-1

}

resource "aws_s3_bucket_versioning" "example-bucket_versioning" {
  bucket = aws_s3_bucket.example-bucket.id
  versioning_configuration {
    status = "Enabled"
  }
}

aws_s3_bucket.example-bucket is a resource in the aws.us-east-1 provider but terraform takes that as the default region resource (In this case ap-northeast-1) in aws_s3_bucket_versioning.example-bucket_versioning and occurs following error.

Error: error waiting for S3 Bucket Versioning status for bucket (example-bucket): BucketRegionError: incorrect region, the bucket is not in 'ap-northeast-1' region at endpoint ''
	status code: 301, request id: , host id: 

[shiimaxx]

Convert to Issue #4