Add support of randomSeed on blockhain entity level

[a-bahdanau]

Is your feature request related to a problem? Please describe.
There is a missing API that would be helpful. Provide way to set randomSeed to make RAND work properly in transactions.

Now that can be done this way only

const res = await blockchain.runGetMethod(example.address,
        'get_method',
        [],
        { randomSeed: randomBytes(32) } // randomSeed can be specified only if calling blockchain.runGetMethod or similar...
);
const number = res.stackReader.readNumber();

Describe the solution you'd like
Provide a setter randomSeed that would affect transaction result