Refactor transaction support #24

Job	Run time
GoLint	37s
GoLint	37s
ReleaseDryRun	7s
ReleaseDryRun	7s
Check format with go fmt	12s
Check format with go fmt	12s
Run tests against local AWS DynamoDB with Go 1.18	57s
Run tests against local AWS DynamoDB with Go 1.18	59s
Run parsing tests with Go 1.18	20s
Run parsing tests with Go 1.18	20s
Run tests against local AWS DynamoDB with Go oldstable	50s
Run tests against local AWS DynamoDB with Go oldstable	1m 2s
Run parsing tests with Go oldstable	9s
Run parsing tests with Go oldstable	9s
Run tests against local AWS DynamoDB with Go stable	1m 4s
Run tests against local AWS DynamoDB with Go stable	1m 26s
Run parsing tests with Go stable	32s
Run parsing tests with Go stable	32s
	10m 12s

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