Add FT.ALIASLIST search command support

[uglide]

Add support for the FT.ALIASLIST command (Query Engine 8.10), which lists all aliases associated with a given index.

• Add ALIASLIST constant and SearchCommandBuilder.AliasList(index)
• Expose AliasList / AliasListAsync on ISearchCommands and ISearchCommandsAsync (returning RedisResult[], matching _List/TagVals)
• Register the new public API surface in PublicAPI.Unshipped.txt
• Add sync and async integration tests (guarded to Redis 8.10+)

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Note

Low Risk
Additive search API and tests only; no changes to auth, data paths, or existing command behavior.

Overview
Adds FT.ALIASLIST (Query Engine 8.10+) so callers can list all aliases bound to a search index name.

AliasList / AliasListAsync are exposed on the search command interfaces and implementations, wired through SearchCommandBuilder.AliasList and returning RedisResult[] (same shape as _List / TagVals). The new public API is registered in PublicAPI.Unshipped.txt.

Integration tests cover empty lists, multiple aliases after add/del, and server errors for missing indexes, gated to Redis 8.10+. Existing alias tests reuse shared helpers that skip on legacy cluster CROSSSLOT failures from FT.ALIASADD.

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