refactor: set up monorepo #1527

Job	Run time
Install on Node.js v18	40s
Install on Node.js v20	43s
Lint on Node.js v18	1m 2s
Test (Unit) on Node.js v18	1m 15s
Audit on Node.js v18	19s
Lint on Node.js v20	49s
Test (Integration) on Node.js v18	10m 32s
Test (Unit) on Node.js v20	1m 10s
Audit on Node.js v20	12s
Test (Integration) on Node.js v20	10m 22s
Test (Integration) on Node.js v18 with L3	12m 7s
Test (Integration) on Node.js v20 with L3	11m 51s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	12m 27s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	13m 15s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	12m 11s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	12m 26s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	12m 23s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	12m 24s
	2h 6m 8s

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