feat: non-18 decimal custom gas token support #1466

Job	Run time
Install on Node.js v18	8s
Install on Node.js v20	13s
Test (Unit) on Node.js v18	1m 11s
Lint on Node.js v18	54s
Test (Unit) on Node.js v20	1m 6s
Audit on Node.js v18	16s
Test (Integration) on Node.js v18	27m 50s
Lint on Node.js v20	46s
Audit on Node.js v20	12s
Test (Integration) on Node.js v20	27m 42s
Test (Integration) on Node.js v18 with L3	20m 26s
Test (Integration) on Node.js v20 with L3	20m 25s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	15m 33s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	15m 37s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	21m 1s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	20m 49s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	15m 37s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	15m 57s
	3h 25m 43s

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