fix(types): fix referenes between store / admin types, change bigNumberValue in cart types

[shahednasser]

• Fix types referencing base entities rather than store / admin entities (mainly useful for OAS to not generate duplicate types unnecessarily, but also technically more correct)
• Use number type instead of BigNumberValue for cart's HTTP types.

Q: Should we change usages of all BigNumberValue to number across HTTP types? From an http layer's perspective, a big number type doesn't hold a real meaning to it.

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