* Remove unused trait implementations

Signed-off-by: Serban Iorga <[email protected]>

* Define encoded_size_hint_u32()

Signed-off-by: Serban Iorga <[email protected]>

* Define TransactionEstimationParams trait

Signed-off-by: Serban Iorga <[email protected]>

* Rework TransactionEstimation

Signed-off-by: Serban Iorga <[email protected]>

* Docs + Renamings

Signed-off-by: Serban Iorga <[email protected]>