fix: Add support for EQ,NE predicates for nullable scalar type values

[igdianov]

No description provided.

[codecov]

Codecov Report

Merging #301 (1026f8e) into master (12f606d) will increase coverage by 0.04%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##             master     #301      +/-   ##
============================================
+ Coverage     74.63%   74.68%   +0.04%     
- Complexity     1082     1087       +5     
============================================
  Files            72       72              
  Lines          4857     4862       +5     
  Branches        695      698       +3     
============================================
+ Hits           3625     3631       +6     
+ Misses          919      918       -1     
  Partials        313      313              

Impacted Files	Coverage Δ
...hql/jpa/query/schema/impl/JpaPredicateBuilder.java	62.16% <80.00%> (+0.60%)	⬆️

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