OrchardZSA backward compatability 0.8.0 (#104)

This pull request aims to generalize the implementation of the Orchard
protocol, providing backward compatibility to support both the new (ZSA)
and the original (non-ZSA - Vanilla) Orchard protocol variants. Key
modifications and enhancements include:

### 1. Trait and Generic Structures for Note Encryption:
- **OrchardDomain Trait:** A new `OrchardDomain` trait in
`note_encryption.rs` differentiates between the original Orchard
(Vanilla) and Orchard ZSA protocols, simplifying the implementation of
the `Domain` trait through abstraction.
- **OrchardDomainBase Generic Struct:** Introduced to contain data used
for internal calculations in both Orchard variants.
- **TransmittedNoteCiphertext Modifications:** This struct is now
generic, supporting various lengths of encrypted note ciphertext to
accommodate both Orchard variants.

### 2. Trait and Generic Structures for Circuit Generalization:
- **OrchardCircuit Trait:** A new `OrchardCircuit` trait in `circuit.rs`
provides an interface for different implementations of the PLONK circuit
tailored to the specific requirements of the Orchard protocol's variants
(Vanilla and ZSA).
- **OrchardCircuitBase Generic Struct:** Contains data for internal
calculations across both Orchard variants.

### 3. Module Organization:
- Introduction of `note_encryption_vanilla.rs`, `note_encryption_zsa.rs`
to support the different types of encrypted notes.
- Introduction of `circuit_vanilla.rs`, and `circuit_zsa.rs` to support
various circuit configurations.

### 4. Test Suite Updates:
Updates to unit tests include separate versions for Vanilla and ZSA
variants, ensuring thorough validation of the modifications.

### 5. Dependency Adaptation:
The adoption of a modified version of the Halo2 Rust crate facilitates
support for both Orchard protocol variants, guaranteeing that all tests,
including those for non-ZSA functionality, pass successfully.

---------

Co-authored-by: Paul <lauxpaul@protonmail.com>
Co-authored-by: Dmitry Demin <dmitry@qed-it.com>
Co-authored-by: Vivek Arte <46618816+vivek-arte@users.noreply.github.com>
Co-authored-by: alexeykoren <2365507+alexeykoren@users.noreply.github.com>

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