feat(v3): non-18 decimal custom gas token support #1414

Job	Run time
Install on Node.js v18	7s
Install on Node.js v20	5s
Test (Unit) on Node.js v18	1m 8s
Audit on Node.js v18	25s
Lint on Node.js v18	54s
Test (Unit) on Node.js v20	1m 11s
Audit on Node.js v20	23s
Test (Integration) on Node.js v18	20m 31s
Lint on Node.js v20	56s
Test (Integration) on Node.js v20	20m 34s
Test (Integration) on Node.js v18 with L3	15m 11s
Test (Integration) on Node.js v20 with L3	15m 10s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	16m 10s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	17m 5s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	16m 59s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	17m 14s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	17m 0s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	17m 12s
	2h 58m 15s

Provide feedback