feat(v3): non-18 decimal custom gas token support #1431

Job	Run time
Install on Node.js v18	10s
Install on Node.js v20	6s
Lint on Node.js v18	55s
Test (Unit) on Node.js v18	1m 9s
Audit on Node.js v18	14s
Lint on Node.js v20	1m 0s
Test (Unit) on Node.js v20	1m 7s
Test (Integration) on Node.js v18	21m 49s
Audit on Node.js v20	14s
Test (Integration) on Node.js v20	21m 45s
Test (Integration) on Node.js v18 with L3	20m 25s
Test (Integration) on Node.js v20 with L3	20m 28s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	17m 26s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	19m 4s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	21m 44s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	21m 45s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	17m 24s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	18m 46s
	3h 25m 31s

Provide feedback