Adapt PlatformTestingTool to work with the Bytes format for system transactions

[IvanKavaldzhiev]

Problem

The PlatformTestingTool should be adapted to generate StateSignatureTransactions and the PlatformTestingToolState to differentiate these Bytes in handleTransaction and ignore the system transactions.

Solution

Update the TransactionGenerator in PlatformTestingTool to generate StateSignatureTransactions and encode them in Bytes.

Update the handleTransaction in PlatformTestingToolState to validate whether the Bytes wrapped in EventTransaction's applicationTransaction is a system transaction.

Alternatives

No response