feat(v3): non-18 decimal custom gas token support #1389

Job	Run time
Install on Node.js v18	4s
Install on Node.js v20	9s
Lint on Node.js v18	55s
Audit on Node.js v18	13s
Lint on Node.js v20	51s
Test (Integration) on Node.js v18	27m 53s
Audit on Node.js v20	14s
Test (Unit) on Node.js v18	1m 18s
Test (Integration) on Node.js v20	27m 44s
Test (Integration) on Node.js v18 with L3	20m 23s
Test (Unit) on Node.js v20	1m 9s
Test (Integration) on Node.js v20 with L3	20m 41s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	19m 38s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	19m 39s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	18m 24s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	17m 0s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	16m 57s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	15m 49s
	3h 29m 1s

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