fix(annotations): format generic arguments with curly braces in doc cref

[reginaldalfret]

Description

In Amazon.Lambda.Annotations.SourceGenerator, XML documentation comments generated on the Lambda function handler class and method use <see cref="..." referencing the containing type and method signature with parameter types.

When a parameter type or containing type is generic (e.g. IEnumerable<string>, IList<IList<int>>, SqsBatchProcessor<Payload, Handler>), the type name was previously emitted with angle brackets < and > into the XML attribute cref="...". This produces unescaped XML inside an attribute value, leading to CS1570, CS1584, and CS1658 compiler warnings whenever consuming projects have <GenerateDocumentationFile>true</GenerateDocumentationFile> enabled.

In C# XML documentation comments, generic type arguments in cref attributes must use curly braces {...} (e.g. IEnumerable{string}).

Changes

• In LambdaFunctionTemplateCode.cs, added FormatCrefType(string typeName) which replaces < and > with { and } for types formatted in cref attributes.
• Updated generator snapshots that include generic parameter types to reflect {} in cref comments.

Fixes #2587