feat: adds `getExecuteTx` method to ChildToParentMessageWriter #1636

Job	Run time
Install on Node.js v20	49s
Install on Node.js v18	59s
Lint on Node.js v18	1m 37s
Audit on Node.js v20	19s
Audit on Node.js v18	19s
Lint on Node.js v20	59s
Test (Unit) on Node.js v18	1m 55s
Test (Unit) on Node.js v20	1m 52s
Test (Integration) on Node.js v18 with L3	20m 25s
Test (Integration) on Node.js v18	23m 3s
Test (Integration) on Node.js v20 with L3	20m 3s
Test (Integration) on Node.js v20	23m 12s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	20m 12s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	20m 31s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	19m 53s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	19m 55s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	19m 54s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	20m 47s
	3h 36m 44s

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