feat(v3): non-18 decimal custom gas token support #1432

Job	Run time
Install on Node.js v18	11s
Install on Node.js v20	6s
Test (Unit) on Node.js v18	1m 15s
Lint on Node.js v18	49s
Test (Integration) on Node.js v18	19m 15s
Test (Unit) on Node.js v20	1m 1s
Lint on Node.js v20	51s
Audit on Node.js v18	16s
Test (Integration) on Node.js v20	19m 16s
Audit on Node.js v20	19s
Test (Integration) on Node.js v18 with L3	19m 15s
Test (Integration) on Node.js v20 with L3	19m 15s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	17m 12s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	18m 40s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	19m 14s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	19m 15s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	19m 1s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	17m 11s
	3h 12m 22s

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