## Description 

Introduce all the logic (but not enable) for the creation of Display
Registry (`0xd`).

This will land before #23710. On that PR, the feature flag will be
enabled & will have e2e tests.

## Test plan 

Just testing that the existing tests pass. 

**This PR does not do the creation of the object, only sets up the types
& logic so we can release in two steps (to avoid breaking indexing)**.
Tests for that will be introduced in the PR that enables the feature
flag, because the move code is not yet landed (so creation cannot really
happen yet!)

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

## Description
GraphQL will look for and preference `sui::display_registry::Display<T>`
over `sui::display::Display<T>` (+ its events) when computing the
Display output for a given Move Value.

## Test plan

New E2E tests:

```
$ cargo nextest run            \
  -p sui-indexer-alt-e2e-tests \
  --test transactional_tests   \
  -- display_v2
```

## Stack

- #23710 
- #25240 
- #25241

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [x] GraphQL: Adds support for Display Registry to GraphQL:
`MoveValue.display` will look for a `Display<T>` stored in the Display
Registry and will use that as the source of truth for its type's format.
This takes precedence over any Display v1 formats that exist for this
type.
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] Indexing Framework:

## Description

Relax the type of `DisplayFieldsResponse` to allow values to be
arbitrary JSON, instead of just strings, so it can support Display v2
fields.

## Test plan

CI

## Stack

- #23710 
- #25242

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] Indexing Framework:

## Description
Replicate the GraphQL alt integration for JSONRPC-alt.

## Test plan

New E2E tests:

```
cargo nextest run              \
  -p sui-indexer-alt-e2e-tests \
  --test transactional_tests   \
  -- jsonrpc/objects/display/display_v2
```

## Stack

- #23710 
- #25242
- #25358 

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] Indexing Framework:

## Description

Add support to legacy JSONRPC for Display v2.

## Test plan

New E2E tests:

```
$ cargo nextest run -p sui-json-rpc-tests --test rpc_server_tests
```

## Stack

- #23710 
- #25242
- #25358 
- #25359 

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] gRPC:
- [x] JSON-RPC: Adds support for Display Registry to JSONRPC: When
`showDisplay` is set, the RPC will look for a `Display<T>` stored in the
Display Registry and will use that as the source of truth for its type's
format. This takes precedence over any Display v1 formats that exist for
this type.
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] Indexing Framework: