feat: add helper module to determine `code_uri` #339

Job	Run time
Module max TF version	2s
Get root directories	5s
Max TF pre-commit (1.8.5)	2m 17s
Min TF validate (.)	20s
Min TF validate (./infrastructure)	19s
Min TF validate (./modules/forwarder)	24s
Min TF validate (./modules/testing/setup)	16s
Min TF validate (./modules/testing/s3_bucket)	14s
Min TF validate (./modules/testing/sqs_queue)	16s
Min TF validate (./modules/testing/exec)	14s
Min TF validate (./modules/logwriter)	9s
Min TF validate (./modules/config)	15s
Min TF validate (./modules/samversion)	14s
Min TF validate (./modules/stack)	19s
Min TF validate (./modules/metricstream)	16s
Min TF validate (./modules/configsubscription)	18s
Min TF validate (./modules/subscriber)	12s
Min TF validate (./examples/stack-http)	25s
Min TF validate (./examples/simple)	14s
Min TF validate (./examples/forwarder-sns)	15s
Min TF validate (./examples/logwriter-manual-subscription)	17s
Min TF validate (./examples/logwriter-auto-subscription)	18s
Min TF validate (./examples/forwarder-kms)	16s
Min TF validate (./examples/stack-filedrop)	20s
	8m 15s

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