Add SDK error code mapping for insurance pool

[Levi-Ojukwu]

Description:

The SDK's ILNErrorCode enum does not include insurance pool error codes.

Acceptance Criteria:

• Add InsuranceNotInitialized, InsuranceAlreadyClaimed, InsuranceInvalidAmount, InsurancePoolEmpty, InsuranceAlreadyInitialized to ILNErrorCode
• Update error handling in SDK methods

Relevant Files: sdk/src/errors.ts, contracts/insurance_pool/src/lib.rs:33-46

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[Heazzy500]

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Want me to clean these up into one stronger template you can reuse?

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[abayomiwav]

@abayomiwav has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I can work on this please

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[Caneryy]

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