Some micro tunings / formatting for ModelProxy and Analyzer

[Rijicho]

Summary

Some micro tunings and formatting for ModelProxy and Analyzer.

Related Issue

Changes

Waffle.Analyzer

• Added a syntax-only pre-filter (HasRenderMethodName) that checks the callee's identifier text before calling SemanticModel.GetSymbolInfo, avoiding expensive semantic lookups on unrelated invocations.
• Replaced the LINQ chain for finding the interpolated string argument with a foreach loop to avoid unnecessary allocations.
• Moved the GetSymbolInfo call after both the name pre-filter and the interpolated-string check so the semantic model is only queried when both conditions pass.
• Replaced _blockStack.Any(f => f.Command.IsIterationBlock) with a dedicated HasIterationFrame() method using a plain foreach, eliminating the LINQ delegate allocation per break/continue check.
• Added an early-return guard in CheckForOutOfScopeVariables when _closedVariables is empty, skipping all descendant-node traversal and semantic queries until at least one block has been closed.

Waffle.ModelProxy

• MemberInfo: Introduced a static precomputed s_paramLists array (indexed by parameter count, up to 4) and replaced the string.Join + Enumerable.Range + Select expressions in ParameterizedAccessorBody and ParameterizedHasAccessorBody with direct index lookups.
• ModelProxyGenerator: Removed a redundant .ToArray() call at the end of a LINQ expression passed to string.Join (the method already accepts IEnumerable).
• ModelProxyTypeInfoForCache: Replaced this.Equals(Default) in the IsDefault property with a direct OriginalFullName.Length == 0 field check, avoiding record structural equality comparison.
• SymbolExtensions: Merged two sequential foreach loops over namedType.AllInterfaces into a single pass; IReadOnlyList still short-circuits immediately, and IEnumerable is captured as a fallback via ??=, halving the number of interface iterations in the IEnumerable-only case.

Checklist

• All existing tests pass (dotnet test -c Debug)
• New functionality is covered by tests
• This PR targets the main branch

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