* Added `query/ResultSet.{Columns,ColumnTypes}` methods for get column names and types from query result set

[asmyasnikov]

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

-

-

Other information

[github-actions[bot]]

github.com/ydb-platform/ydb-go-sdk/v3/query

incompatible changes

ResultSet.ColumnTypes: added ResultSet.Columns: added

summary

Base version: v3.70.1-0.20240605131929-e94c8c81bb3b (master) Cannot suggest a release version. Can only suggest a release version when compared against the most recent version of this major: v3.70.0.

[github-actions[bot]]

:volcano: Here are results of SLO test for Native ydb-go-sdk/v3 over table-service:

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[github-actions[bot]]

:volcano: Here are results of SLO test for Go SDK gorm:

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[github-actions[bot]]

:volcano: Here are results of SLO test for Go SDK database/sql:

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[github-actions[bot]]

:volcano: Here are results of SLO test for Go SDK xorm:

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[github-actions[bot]]

:volcano: Here are results of SLO test for Native ydb-go-sdk/v3 over query-service:

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