Pczt without domain

[alexeykoren]

This PR removes generic type parameter from Orchard PCZT bundle simplifying the flow in librustzcash

[what-the-diff]

PR Summary

• Simplified code by removing 'OrchardDomainCommon' and 'TransmittedNoteCiphertext'

  • The builder.rs file was adjusted where references to OrchardDomainCommon and TransmittedNoteCiphertext were removed. This simplifies the structure and makes the code more readable.

• Shifted from complex generic types to simple, non-generic types

  • In many files, such as builder.rs, issuance.rs, pczt.rs and others, functions and structs that earlier used complex generic types have been simplified. Now, instead of dealing with a higher-level abstraction, a direct non-generic type is used.

• Introduced new marker type 'EffectsOnly' in issuance.rs

  • New marker type EffectsOnly has been added, which apply to bundles that don't carry any authorizing data. This helps in differentiating them from other types of bundles.

• Added conversion logic using PcztTransmittedNoteCiphertext

  • Conversion logic code using PcztTransmittedNoteCiphertext was added in builder.rs which helps in adapting with existing note ciphertext structures.

• Revised parsing logic in parse.rs

  • Changes in parse.rs to modify parsing logic has been introduced to sync up with other structural changes in the code.

• Modification in implementation

  • Code modifications were done in prover.rs, signer.rs, and pczt to simplify implementations of bundles and actions. It moderates the function signatures to align with the changes.

• Streamlined Bundle and Updater in updater.rs

  • Changes made in updater.rs saw the simplification of Bundle and Updater by omitting the generic parameterization, leading to a cleaner and more straightforward overall structure.

• Harmonized the structure for verification methods in verify.rs

  • The verification methods in verify.rs have been refactored to remove generic type parameters for structs. This ensures cohesion with the revised, non-generic structure used across various files.

Through these changes, the code is more readable, manageable, and easier to debug, thereby improving the overall maintainability and performance.

[PaulLaux]

added some changes needed. The approach is accepted overall.