Query anonymization should work in fallback log

[LantaoJin]

Description

Query anonymization is not working in the fallback log. JOIN query and other queries which trigger fallback to old engine are not anonymous in logs.

POST /_plugins/_sql
{
  "query" : """
  SELECT s.FlightNum, s.OriginCityName, d.DestCityName
    FROM opensearch_dashboards_sample_data_flights s
      JOIN opensearch_dashboards_sample_data_flights d
        ON s.DestCityName = d.OriginCityName
  """
}

Request SQLQueryRequest(jsonContent={"query":"\n SELECT s.FlightNum, s.OriginCityName, d.DestCityName FROM opensearch_dashboards_sample_data_flights s JOIN opensearch_dashboards_sample_data_flights d ON s.DestCityName = d.OriginCityName\n "}, query=
SELECT s.FlightNum, s.OriginCityName, d.DestCityName FROM opensearch_dashboards_sample_data_flights s JOIN opensearch_dashboards_sample_data_flights d ON s.DestCityName = d.OriginCityName
, path=/_plugins/_sql, format=jdbc, params={pretty=true}, sanitize=true, cursor=Optional.empty) is not supported and falling back to old SQL engine

This PR resolves it by adding a new toString() method with a lambda function parameter anonymizer in SQLQueryRequest since QueryDataAnonymizer is in org.opensearch.sql.legacy package.

With this fixing, the new log show like

Request SQLQueryRequest(query=( SELECT identifier, identifier, identifier FROM table s JOIN table d ON identifier = identifier ), path=/_plugins/_sql, format=jdbc, params={pretty=true}, sanitize=true, cursor=Optional.empty) is not supported and falling back to old SQL engine

Issues Resolved

Resolves #2803

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
  • [ ] New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[LantaoJin]

The build failures are not related to this PR. It looks like GLIBC lib is missing in current Linux docker image. All CI tasks passed in Windows docker.

[dai-chen]

Just wonder do you see future requirement for different anonymizer? Is toString(boolean anonymized) or copy to a new request clear enough?

[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity.

[YANG-DB]

@LantaoJin is it still relevant?
Thanks 🙏