(rust): Add an INFO section enum matching the other GLIDE clients #7366

Describe the feature

Add an INFO section enum to the Rust client (rust/, crate valkey-glide) that matches the other GLIDE clients.

Today, ServerManagementCommands::info_sections (rust/src/commands/server_management.rs) accepts any &[S] where S: ToValkeyArgs, so callers pass free-form strings:

let info = client.info_sections(&["persistence"]).await?;

The other GLIDE clients have a section enum with the same members, sorted alphabetically since #7364:

Their members: all, clients, cluster, cluster_info (Valkey 9.1.0+), commandstats, cpu, default, errorstats, everything, keyspace, latencystats, memory, modules, persistence, replication, sentinel, server, stats.

Use Case

• Discoverability: IDE completion and the generated docs would list the valid sections, with a doc comment for each, including which Valkey version added it (e.g. cluster_info).
• Correctness: a typo such as "persistance" compiles, and the server quietly returns an empty reply for it. An enum variant can't be misspelled.
• Consistency: Rust code would read the same way as the other GLIDE clients (InfoSection::Persistence, like Python's InfoSection.PERSISTENCE).

Proposed Solution

• Add an InfoSection enum to rust/src/commands/options.rs, which mirrors Python's core_options. Include all 18 sections, in alphabetical order, with doc comments matching the other clients.
• Implement ToValkeyArgs for it, as ExpireOption and the other option enums there do, writing the lowercase section name.
• info_sections is already generic over ToValkeyArgs, so it would accept &[InfoSection::Persistence] with no signature change, and string callers keep working. Keeping strings also covers module-defined sections, which the enum can't list. Decide whether that's the intended API, or whether info_sections should accept only InfoSection, which would be a breaking change, acceptable while the crate is in 0.x preview.
• Use the enum in the Rust tests (e.g. get_info and info_returns_expected_fields in rust/tests/).
• Consider doing this together with (rust): Typed multi-node server commands fail on cluster clients #7362, which changes the return types of the typed INFO methods.

Other Information

Found while working on #7199 (#7364), which added cluster_info to the Go, Java, Node and Python section enums. Rust had nothing to add it to.

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Client version used

valkey-glide (Rust) 0.9.0

Environment details (OS name and version, etc.)

⚪ Not applicable