feat(flinksql): add some lexer

src/grammar/flinksql/FlinkSqlLexer.g4

@@ -299,10 +299,37 @@ ROW:                          'ROW';
 NULL:                         'NULL';
 
 
-// single character Keywords
+// Operators. Comparation
 
-EQUAL:                        '=';
-COMMA:                        ',';
+EQUAL_SYMBOL:                        '=';
+GREATER_SYMBOL:                      '>';
+LESS_SYMBOL:                         '<';
+EXCLAMATION_SYMBOL:                  '!';
+
+
+// Operators. Bit
+
+BIT_NOT_OP:                          '~';
+BIT_OR_OP:                           '|';
+BIT_AND_OP:                          '&';
+BIT_XOR_OP:                          '^';
+
+
+// Constructors symbols
+
+DOT:                                 '.';
+LR_BRACKET:                          '(';
+RR_BRACKET:                          ')';
+COMMA:                               ',';
+SEMICOLON:                           ';';
+AT_SIGN:                             '@';
+ZERO_DECIMAL:                        '0';
+ONE_DECIMAL:                         '1';
+TWO_DECIMAL:                         '2';
+SINGLE_QUOTE_SYMB:                   '\'';
+DOUBLE_QUOTE_SYMB:                   '"';
+REVERSE_QUOTE_SYMB:                  '`';
+COLON_SYMB:                          ':';
 
 
 fragment ID_LITERAL:                 [A-Z_0-9a-z]*?[A-Z_a-z]+?[A-Z_0-9a-z]*;

src/grammar/flinksql/FlinkSqlParser.g4

@@ -5,13 +5,21 @@ options { tokenVocab=FlinkSqlLexer; }
 program: statement EOF;
 
 statement
-    : sqlStatement EOF
+    : sqlStatements EOF
+    ;
+
+sqlStatements
+    : (sqlStatement SEMICOLON | emptyStatement)*
     ;
 
 sqlStatement
     : ddlStatement | dmlStatement
     ;
 
+emptyStatement
+    : SEMICOLON
+    ;
+
 ddlStatement
     : createTable | createDatabase | createView | createFunction
     | alterTable | alterDatabase | alterFunction
@@ -24,13 +32,13 @@ dmlStatement
 
 createTable
     : CREATE TABLE tableName
-    ( 
-        columnOptionDefinition (',' columnOptionDefinition)*
-    )
+    LR_BRACKET 
+        columnOptionDefinition (COMMA columnOptionDefinition)*
+    RR_BRACKET
     partitionDefinition?
-    WITH (
-        withOptionDefinition (',' withOptionDefinition)*
-    )
+    WITH LR_BRACKET
+        withOptionDefinition (COMMA withOptionDefinition)*
+    RR_BRACKET
     ;
 
 
@@ -67,7 +75,7 @@ partitionColumnName
     ;
 
 withOptionDefinition
-    : REVERSE_QUOTE_ID EQUAL REVERSE_QUOTE_ID
+    : REVERSE_QUOTE_ID EQUAL_SYMBOL REVERSE_QUOTE_ID
     ;
 
 createDatabase