feat(array): add variadic array construction

[Seddryck]

Summary

• add variadic array(...) construction with positional and spread arguments
• support explicit and implicit spread in function calls and array literals
• reject named array arguments and invalid spread forms during binding
• upgrade Expressif.Syntax to 0.28.0 and refactor binder tests to construct syntax directly

Validation

• dotnet build Expressif.sln
• Expressif.Testing on net8.0, net9.0, and net10.0: 3,027 passed and 1 skipped per framework
• Expressif.Cli.Tests on net10.0: 206 passed
• dotnet format Expressif.sln analyzers --verify-no-changes --no-restore

Closes #645

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[sonarqubecloud]

Quality Gate passed

Issues
2 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

[codecov]

Codecov Report

❌ Patch coverage is 80.92105% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.22%. Comparing base (4546914) to head (e9113b6).
⚠️ Report is 1 commits behind head on next-major.

Files with missing lines	Patch %	Lines
Expressif/Functions/FunctionFactory.cs	82.53%	8 Missing and 3 partials ⚠️
Expressif/Functions/BaseExpressionFactory.cs	0.00%	8 Missing ⚠️
Expressif/Bindings/ExpressifBinder.cs	89.74%	0 Missing and 4 partials ⚠️
Expressif/Serializers/FunctionSerializer.cs	0.00%	1 Missing and 1 partial ⚠️
Expressif/Values/ParameterValueConverter.cs	75.00%	1 Missing and 1 partial ⚠️
Expressif/Functions/Array/Array.cs	95.45%	1 Missing ⚠️
Expressif/Serializers/ParameterSerializer.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           next-major     #660      +/-   ##
==============================================
- Coverage       84.75%   84.22%   -0.53%     
==============================================
  Files             218      219       +1     
  Lines            6008     6143     +135     
  Branches         1060     1089      +29     
==============================================
+ Hits             5092     5174      +82     
- Misses            600      643      +43     
- Partials          316      326      +10     

Flag	Coverage Δ
expressif-cli-net10.0	39.73% <42.10%> (-0.12%)	⬇️
expressif-net10.0	81.04% <78.94%> (-0.64%)	⬇️
expressif-net8.0	81.04% <78.94%> (-0.64%)	⬇️
expressif-net9.0	81.04% <78.94%> (-0.64%)	⬇️

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