Threshold encryption needs to be able to get the last argument of a smart contract call from Ethereum transaction

Provide an implementation of the following interface

class EncryptedTransactionAnalyzer {

public: virtual shared_ptr<std::vector<uint8_t>> getEncryptedData( const std::vector<uint8_t>& transaction) = 0;

};

• If transaction data includes a byte segment:
• starting wth TE_MAGIC_START=0xf84a1cf7214ae051cae8
• ending with TE_MAGIC_END=0x98a773d884b2f1c4ac27

Return this byte segment (without magic numbers) as a shared pointer to bytes

Otherwise, return null

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