Fix compiled queries with IsOneOf and array parameters

[jeremydmiller]

Summary

Fixes compiled queries that use IsOneOf() with array-typed parameters (e.g., string[]) and IQueryPlanning. Previously, string[] properties on compiled query classes were incorrectly classified as Include members (because string[] implements IList<string>), causing the parameter to be hardcoded with the template value instead of reading from the query instance at runtime.

Root cause: CompiledQueryPlan.sortMembers() checked IList<> before checking if the type was an array with a known parameter finder. Since string[] implements IList<string>, it was added to IncludeMembers instead of QueryMembers.

The fix has four parts:

1. CompiledQueryPlan.sortMembers: Check for array types with known element-type finders before the IList<> check
2. ArrayParameterFinder<T>: New finder that matches T[] types and provides unique array values for query planning
3. QueryMember.tryToFind: Use structural array comparison instead of reference equality when matching parameter values
4. ParameterUsage.generateSimpleCode: Emit correct composite NpgsqlDbType (Array | ElementType) for array parameters

Supersedes #4202 (includes the test from that PR plus the fix)

Test plan

• New test can_search_isOneOf_strings_with_compiled_queries_and_query_planning passes
• All 1248 LinqTests pass with zero regressions
• Solution compiles via nuke compile

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