feat(array): add generate function

[Seddryck]

Summary

• add the generate array-construction function for iterating from any seed
• support required named while and next expressions plus optional result projection
• preserve the specified while → result → next evaluation order
• add function metadata, conformance cases, parser/factory integration, and focused behavioral tests

Why

Closes #463. Expressif can now materialize a sequence as one array value while keeping iteration state separate from projected output values.

Implementation notes

Generate implements IFunction directly because its input is an arbitrary seed, not an existing array. Named arguments may be supplied in any order, which supports the documented Fibonacci form where result precedes next.

Validation

• dotnet build Expressif.Testing/Expressif.Testing.csproj --no-restore (net8.0, net9.0, net10.0)
• full .NET 8 test suite: 2,768 passed, 1 skipped

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[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud