feature: Add query string

[bayraktugrul]

• query string is added
  https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html

• The file query.go was renamed to base_query.go to prevent IDEs from grouping files with the same prefix. Since the feature is related to query_string, base_query is a more appropriate name. Another suggestions are welcomed.

• documentation: done

• integration tests: done

Note: I will add BulkInsert, BulkDelete to ElasticsearchRepository in another PR. Also I will update go-await library to wait multiple tasks then update here. It seems it is a need to write integration tests cleaner.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (cb21fda) to head (b61b95d).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #2   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        18    +1     
  Lines          322       395   +73     
=========================================
+ Hits           322       395   +73     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.