• fixes response handler return type for typescript
• aligns switch style
• fixes an issue where unresolved types would return empty
• fixes java classes casing
• fixes response handler type for java
• adds missing imports for java - fixes imports duplication
• updates CSharp debug location
• fixes casing for default return type
• adds default usings at the class level and not namespace

Note: there's still a bug in the CSHarp writer because of the recent change of not using namespaces as an entry point. The mapping needs to be updated like Java/Tyepescript, and the usings need to be tested
Note: There's still a bug in Java for the import for the GraphClient. It needs to do relative calculation like typescript does.