[11/n][enums/Sui] Graphql and json-rpc support for enums

[tzakian]

Description

Adds support for Move enums to both graphql and json-rpc. This adds a couple different things. At a high level:

1. Adds an interface IMoveDatatype that allows for access to common fields between both Move structs and enums (e.g., name, type parameters, abilities).
2. Adds methods datatype(name: String) and datatypes to MovePackage that returns datatypes. Note that datatype names are still sorted in the same way as before in pagination (in particular: it will not be paginated as all structs, then all enums or vis-versa, but paginated in sorted order on the datatype names). This is due to the way datatypes is implemented in the package resolver.
3. Adds MoveEnum as a GraphQL type and associated machinery.

This PR is meant to be a logically-reviewable portion but is not land-able on its own. It must be merged in with the changes in the rest of this stack to be landed.

Stack:

• #17245
• #17246
• #17247
• #17248
• #17249
• #17250 << You are here
• #17251

Test plan

Added new tests in this PR for the new features.

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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):
• [ ] Indexer:
• [X] JSON-RPC:
• [X] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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