feat: add externalrole module #372

Job	Run time
Module max TF version	2s
Get root directories	6s
Max TF pre-commit (1.9.4)	2m 48s
Min TF validate (.)	20s
Min TF validate (./examples/forwarder-kms)	18s
Min TF validate (./examples/forwarder-s3)	19s
Min TF validate (./examples/logwriter-auto-subscription)	15s
Min TF validate (./examples/stack-http)	17s
Min TF validate (./examples/simple)	17s
Min TF validate (./examples/forwarder-sns)	20s
Min TF validate (./examples/stack-filedrop)	16s
Min TF validate (./examples/logwriter-manual-subscription)	28s
Min TF validate (./infrastructure)	16s
Min TF validate (./modules/stack)	15s
Min TF validate (./modules/testing/sqs_queue)	13s
Min TF validate (./modules/testing/s3_bucket)	16s
Min TF validate (./modules/testing/exec)	8s
Min TF validate (./modules/testing/setup)	19s
Min TF validate (./modules/subscriber)	18s
Min TF validate (./modules/logwriter)	20s
Min TF validate (./modules/externalrole)	16s
Min TF validate (./modules/cloudtrail)	18s
Min TF validate (./modules/metricstream)	19s
Min TF validate (./modules/sam_asset)	16s
Min TF validate (./modules/config)	15s
Min TF validate (./modules/forwarder)	16s
Min TF validate (./modules/configsubscription)	27s
	9m 58s

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