Modularize the transaction model

[maht0rz]

Is your feature request related to a problem? Please describe. As of now, the transaction model has no built-in support for users to specify fees, or fee limits.

Describe the solution you'd like We want to make the transaction model modular, so that things such as nonce, signature, tx fees etc. can be handled for example as transaction hooks and made part of the transaction model independently.

Describe alternatives you've considered N/A

Additional context N/A