Add impl on positionsGet.ts

[aggre]

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Add impl on:

dev-kit-js/lib/agent/positionsGet.ts

Lines 1 to 8 in 872b06e

	import { Provider } from '@ethersproject/abstract-provider'
	import { UndefinedOr } from '@devprotocol/util-ts'
	import { Positions } from '../ethereum/s-tokens/positions'
	type PositionsGet = (options: {
	readonly provider: Provider
	readonly positionId: number
	}) => Promise<UndefinedOr<Positions>>

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[aggre]

Add impl on positionsGet.ts