feat: support versioned solana txs

[Philippoes]

This pull request updates the Solana connector to improve transaction deserialization and support both legacy and versioned transactions. The main change is to handle both base64 and hex-encoded transaction payloads, and to correctly deserialize either a legacy Transaction or a VersionedTransaction before sending it.

Transaction deserialization improvements:

• Updated the sendTransaction method to detect whether the input transaction is base64 or hex-encoded, and to deserialize it as either a VersionedTransaction or a legacy Transaction as appropriate. This ensures compatibility with both transaction formats and encoding types.
• Added the VersionedTransaction import from @solana/web3.js to support the new deserialization logic.

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Latest commit: 7bbd18c

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Pull request overview

This pull request enhances the Solana connector to support both legacy and versioned transactions while handling multiple encoding formats. The implementation adds auto-detection of transaction encoding (base64 vs hex) and automatic fallback between VersionedTransaction and legacy Transaction deserialization.

Key changes:

• Added encoding detection logic to handle both base64 and hex-encoded transaction payloads
• Implemented try-catch pattern to deserialize VersionedTransaction first, falling back to legacy Transaction
• Imported VersionedTransaction from @solana/web3.js

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