Add impl on positionsClaim.ts

[aggre]

What would you like to share?

Add impl on: https://github.com/dev-protocol/dev-kit-js/blob/872b06ec19f1c25347957694268aa72d44c1bd84/lib/agent/positionsClaim.ts#L1-L11

Additional information

• This function calls lib/ethereum/lockup/withdrawByPosition.ts on L1.
• This function calls lib/l2/lockup on L2.
• The implementation of these lines should be helpful.

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[aggre]

Add impl on positionsClaim.ts