FIX: parsing of decimal numbers

Summary

Fix for https://gitlab.com/linkahead/linkahead-server/-/issues/239

Focus

The decimal_number token could eat whitespaces which lead to the use of atom rule where it should not happen.

Test Environment

pipeline and new unit test

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src/main/java/org/caosdb/server/query/CQLLexer.g4

@@ -433,7 +433,7 @@ WHITE_SPACE_f:
 
 /** */
 WHITE_SPACE:
-    [ \t\n\r]+
+    WHITE_SPACE_f
 ;
 
 /** */
@@ -529,9 +529,9 @@ COLON:
 
 /** Matches signed and unsigned numbers with decimal points, also numbers in scientific notation. */
 DECIMAL_NUMBER:
-    ((HYPHEN_f | PLUS ) WHITE_SPACE_f?)? 
-    ( NUM_f? DOT NUM_f WHITE_SPACE_f? E_NOTATION_f?
-    | NUM_f WHITE_SPACE_f? E_NOTATION_f
+    ((HYPHEN_f | PLUS ) WHITE_SPACE_f?)?
+    ( NUM_f? DOT NUM_f (WHITE_SPACE_f? E_NOTATION_f)?
+    | NUM_f (WHITE_SPACE_f? E_NOTATION_f)?
     )
 ;