Research transactions simulation on the verifier

[Kirqkas]

Simulate and validate plugin-initiated transactions to enforce user-defined plugin policy during co-signing of transactions.
The verifier server acts on the user's behalf and should always validate whether a given proposed transaction conforms to the policy.
In the case of the DCA policy, it should check if the from, to, amount, etc. in the transaction are correct.

related vultisig/vultiserver-plugin#28

[Kirqkas]

4 days needed

[Mihail-Genchev]

At this stage there will be added these validations:

• Policy Validation: zero addresses checks , source token address is different than destination token address, chain ID, amount.
• Transaction validation: chain ID matches policy, Destination address checks, Gas limit and gas price checks, total amount, method signature validation.

Transaction history query and blockchain state query can be added later.