Adding event builder stub

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180199 a5903396-d722-0410-b921-86c7d4935375
Adding event processor stub

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180201 a5903396-d722-0410-b921-86c7d4935375
Adding event formatter stub

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180203 a5903396-d722-0410-b921-86c7d4935375
Adding event tracer stub

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180204 a5903396-d722-0410-b921-86c7d4935375
Adding event statistics stub

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@180205 a5903396-d722-0410-b921-86c7d4935375