feat(v3): non-18 decimal custom gas token support #1441

Job	Run time
Install on Node.js v18	5s
Install on Node.js v20	7s
Audit on Node.js v18	23s
Test (Unit) on Node.js v18	1m 9s
Audit on Node.js v20	24s
Lint on Node.js v18	1m 6s
Test (Unit) on Node.js v20	1m 19s
Test (Integration) on Node.js v18	27m 47s
Lint on Node.js v20	51s
Test (Integration) on Node.js v20	27m 54s
Test (Integration) on Node.js v18 with L3	20m 28s
Test (Integration) on Node.js v20 with L3	20m 45s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	19m 40s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	21m 11s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	19m 45s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	21m 31s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	20m 12s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	22m 45s
	3h 47m 22s

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