Add Solana Smart Wallet Tests

[devin-ai-integration]

Add comprehensive test coverage for Solana Smart Wallet functionality in both TypeScript and Python implementations.

Tests added:

• Wallet creation and retrieval
• Message signing
• Transaction handling
• Error cases

Tested with both custodial and smart wallet API keys.

Link to Devin run: https://app.devin.ai/sessions/d279fd606e8c481d92746162461b047d
Requested by: [email protected]

[devin-ai-integration]

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Latest commit: 4ddaed6

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