feat(v3): non-18 decimal custom gas token support #1428

Job	Run time
Install on Node.js v18	9s
Install on Node.js v20	7s
Test (Unit) on Node.js v18	1m 14s
Audit on Node.js v18	27s
Test (Integration) on Node.js v18	27m 23s
Test (Unit) on Node.js v20	1m 8s
Audit on Node.js v20	20s
Lint on Node.js v18	1m 1s
Test (Integration) on Node.js v20	27m 26s
Lint on Node.js v20	51s
Test (Integration) on Node.js v18 with L3	20m 38s
Test (Integration) on Node.js v20 with L3	20m 38s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	15m 39s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	17m 6s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	15m 47s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	15m 52s
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)	16m 55s
	3h 19m 41s

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