Fix syntax highlighting for .class files

[fbricon]

Description

Syntax highlighting was missing when adding snippets from a Java .class file to the context. This was caused by 2 issues:

• class was not mapped to java
• the extension mapping would fail because the extension would contain the snippet range, like class (1-13)

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

Before

After

Testing instructions

• install vscode-java
• create a java file like

void main() {
   System.out.println("Hello World!');
}

• Ctrl+click on System to open System.class
• highlight some code, Ctrl+L to add to the Chat context
• the snippet should be highlighted as Java

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[sestinj]

Great, and thanks for adding the test!