R/aws backup selection

[devonbleak]

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Fixes #7166 - should be the last resource required to close

Changes proposed in this pull request:

• Add resource aws_backup_selection

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAwsBackupSelection'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAwsBackupSelection -timeout 120m
=== RUN   TestAccAwsBackupSelection_basic
=== PAUSE TestAccAwsBackupSelection_basic
=== CONT  TestAccAwsBackupSelection_basic
--- PASS: TestAccAwsBackupSelection_basic (65.25s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       67.521s

Possibly controversial things:

• API packages almost everything into a single BackupSelection block which I flattened into the main resource.
• Adopted the IAM condition test/variable/value style for tag_condition so they're consistent, but would be an easy fix to convert to the API's native type/key/value if desired.

[ewbankkit]

See also #7382.

[devonbleak]

See also #7382.

@ewbankkit Not sure how I missed that one - taking a look they seem very similar, will close this one.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!