Add Generic Exception and handler to handle all exceptions

[pavankjadda]

1. Add Generic Exception and handler to handle all exceptions
2. Create ErrorMessage class to standardize error message format

[pavankjadda]

public class ErrorMessage implements Serializable
{
    private static final long serialVersionUID = 6330014835965189038L;

    private String message;
    private String errorCode;
    private HttpStatus status;
    private Integer statusCode;
    private LocalDateTime timestamp;
    private Map<String,String> errors;
    private String path;

}

[pavankjadda]

Commit dcf5aeba3fce8c816051c0e7c8cd183a21710e35 implements this