feat: non-18 decimal custom gas token support #1467

Job	Run time
Install on Node.js v18	14s
Install on Node.js v20	13s
Test (Unit) on Node.js v18	1m 12s
Audit on Node.js v18	14s
Lint on Node.js v18	1m 0s
Test (Unit) on Node.js v20	58s
Audit on Node.js v20	13s
Test (Integration) on Node.js v18	27m 36s
Lint on Node.js v20	57s
Test (Integration) on Node.js v20	27m 56s
Test (Integration) on Node.js v18 with L3	20m 38s
Test (Integration) on Node.js v20 with L3	20m 23s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	21m 12s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	21m 6s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	20m 51s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	20m 54s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	20m 52s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	20m 56s
	3h 47m 25s

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