fix: waiter circular dependency

[AaronDabney]

Circular Dependency in Waiter Module

Problem: lib/common/index.ts ↔ lib/common/lib/waiter.ts

Solution: Import OciError directly from ./error.ts in waiter.ts instead of from parent index

Reference Issue: #391

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[AaronDabney]

"If you are an Oracle employee, please make sure that you are a member of the main Oracle GitHub organization, and your membership in this organization is public."

I meet both of these criteria.