feat: non-18 decimal custom gas token support #1461

Job	Run time
Install on Node.js v18	48s
Install on Node.js v20	50s
Test (Unit) on Node.js v18	1m 11s
Audit on Node.js v18	16s
Lint on Node.js v18	50s
Test (Unit) on Node.js v20	1m 7s
Audit on Node.js v20	13s
Lint on Node.js v20	51s
Test (Integration) on Node.js v18	27m 38s
Test (Integration) on Node.js v20	27m 31s
Test (Integration) on Node.js v18 with L3	20m 38s
Test (Integration) on Node.js v20 with L3	20m 37s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	13m 27s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	14m 2s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	13m 26s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	13m 46s
Test (Integration) on Node.js v18 with L3 with custom gas token (20 decimals)	13m 19s
Test (Integration) on Node.js v20 with L3 with custom gas token (20 decimals)	13m 16s
	3h 3m 46s

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