Add measure points to request execution

[sgohlke]

Please add time measure points to different parts of the GraphQLServer so we can measure execution time for different parts of the requests.

Measure points:

• Entry of core functions
• After request information extraction, i.e. after calling getRequestInformation
• In execution, after calling parseFunction
• In execution, after calling validateFunction
• In execution, after calling executeFunction
• In execution, after calling extensionFunction
• After request execution, i.e. after calling executeRequestWithInfo
• Before sending response in ResponseHandler.sendResponse