chore: including the Null, NotNull and countAll keywords in Met…

…hod.g4 grammar

Signed-off-by: Maximillian Arruda <dearrudam@gmail.com>

antlr4/org/eclipse/jnosql/query/grammar/method/Method.g4

@@ -2,9 +2,9 @@ grammar Method;
 select: selectStart where? order? EOF;
 deleteBy: 'deleteBy' where? EOF;
 
-selectStart: 'find' limit 'By' | 'findBy'| 'countBy'| 'existsBy';
+selectStart: 'find' limit 'By' | 'findBy' | 'countAll' | 'countBy' | 'existsBy';
 where: condition (and condition| or condition)* ;
-condition: eq | gt | gte | lt | lte | between | in | like | truth | untruth;
+condition: eq | gt | gte | lt | lte | between | in | like | truth | untruth | nullable;
 order: 'OrderBy' orderName (orderName)*;
 orderName: variable | variable asc | variable desc;
 limit : 'First' max?;
@@ -22,6 +22,7 @@ lte: variable not? 'LessThanEqual';
 between: variable not? 'Between';
 in: variable not? 'In';
 like: variable not? 'Like';
+nullable: variable not? 'Null';
 not: 'Not';
 variable: ANY_NAME;
 max: INT;