feat(v3): non-18 decimal custom gas token support #1419

Job	Run time
Install on Node.js v18	7s
Install on Node.js v20	8s
Lint on Node.js v18	1m 3s
Test (Unit) on Node.js v18	1m 9s
Lint on Node.js v20	58s
Audit on Node.js v18	22s
Test (Unit) on Node.js v20	1m 14s
Audit on Node.js v20	17s
Test (Integration) on Node.js v18	27m 46s
Test (Integration) on Node.js v20	27m 48s
Test (Integration) on Node.js v18 with L3	20m 33s
Test (Integration) on Node.js v20 with L3	20m 42s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	17m 14s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	15m 55s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	16m 19s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	17m 56s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	17m 25s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	17m 27s
	3h 24m 23s

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