feat: non-18 decimal custom gas token support #1465

Job	Run time
Install on Node.js v18	45s
Install on Node.js v20	49s
Audit on Node.js v18	16s
Test (Integration) on Node.js v18	27m 36s
Audit on Node.js v20	25s
Lint on Node.js v18	50s
Test (Integration) on Node.js v20	27m 37s
Test (Unit) on Node.js v18	1m 17s
Lint on Node.js v20	57s
Test (Integration) on Node.js v18 with L3	20m 19s
Test (Unit) on Node.js v20	1m 10s
Test (Integration) on Node.js v20 with L3	20m 26s
Test (Integration) on Node.js v18 with L3 with custom gas token (16 decimals)	13m 38s
Test (Integration) on Node.js v20 with L3 with custom gas token (16 decimals)	13m 38s
Test (Integration) on Node.js v18 with L3 with custom gas token (18 decimals)	13m 37s
Test (Integration) on Node.js v20 with L3 with custom gas token (18 decimals)	13m 24s
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)	14m 3s
	3h 4m 6s

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