feat(v3): non-18 decimal custom gas token support #1388

Job	Run time
Install on Node.js v18	5s
Install on Node.js v20	7s
Test (Unit) on Node.js v18	1m 18s
Lint on Node.js v18	1m 0s
Audit on Node.js v18	19s
Test (Integration) on Node.js v18	20m 12s
Lint on Node.js v20	1m 22s
Test (Unit) on Node.js v20	1m 19s
Audit on Node.js v20	17s
Test (Integration) on Node.js v20	20m 16s
Test (Integration) on Node.js v18 with L3	20m 11s
Test (Integration) on Node.js v20 with L3	20m 13s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	20m 11s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	20m 12s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	20m 11s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	20m 9s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	20m 10s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	20m 11s
	3h 27m 43s

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