Use @api3/contracts instead of @api3/chains

[PrenaamD]

Following @api3/chains merge into @api3/contracts, affected repos should be updated to stop using @api3/chains

[hiletmis]

@dcroote is there a blocker for migration. I can do it if there is not.

[dcroote]

Nope - no blocker, and I'm happy to review if you'd like