refactor: set up monorepo #1525

Job	Run time
Install on Node.js v18	45s
Install on Node.js v20	41s
Test (Unit) on Node.js v18	1m 11s
Audit on Node.js v18	12s
Test (Unit) on Node.js v20	1m 9s
Test (Integration) on Node.js v18	10m 33s
Audit on Node.js v20	17s
Lint on Node.js v18	51s
Test (Integration) on Node.js v20	10m 33s
Lint on Node.js v20	1m 6s
Test (Integration) on Node.js v18 with L3	11m 59s
Test (Integration) on Node.js v20 with L3	12m 4s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	12m 38s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	12m 37s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	12m 31s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	12m 34s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	12m 51s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	12m 24s
	2h 6m 56s

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