Make all WriteTo methods in MLIR.Syntax public; remove Action callbacks

[Copilot]

All WriteTo methods on MLIR syntax nodes were internal, and several accepted Action<> delegate callbacks to handle recursive writing — making them awkward to call externally and tightly coupled to SyntaxWriter internals.

Changes

• MLIR.Syntax nodes — promoted WriteTo on BlockArgumentSyntax, BlockSyntax, ModuleSyntax, OperationSyntax, and RegionSyntax from internal to public; added XML doc comments
• Removed Action<> parameters — OperationBodySyntax, GenericOperationBodySyntax, OperationSyntax, RegionSyntax, and BlockSyntax no longer accept write-region/write-operation callbacks; recursive writes now call writer.WriteRegion / writer.WriteOperation directly
• SyntaxWriter — removed the now-redundant static lambda adapters from WriteOperation, WriteRegion, and WriteBlock
• Generator (DialectSourceEmitter) — updated the emitted WriteTo override signature to match
• Tests — updated manual OperationBodySyntax subclasses and the generator snapshot assertion

Before:

// internal, requires a callback delegate
internal void WriteTo(SyntaxWriter writer, int indentLevel,
    Action<SyntaxWriter, RegionSyntax, int> writeRegion);

After:

// public, no callback needed
public void WriteTo(SyntaxWriter writer, int indentLevel);

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