Mark Shiryaev

Setup Kover as test coverage tool

15

Closes #2557. Run `./gradlew koverMergedHtmlReport` to build merged html report for all projects. Example:

Add support for batch operations (R2DBC)

15

Add support for batch operations to the [DefaultDatabaseClient](https://github.com/spring-projects/spring-framework/blob/main/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java): ```java databaseClient.sql("INSERT INTO legoset (id, name, manual) VALUES(:id, :name, :manual)") .bind("id", 42055) .bind("name", "SCHAUFELRADBAGGER") .bindNull("manual", Integer.class) .add() .bind("id", 2021) .bind("name", "TOM") .bindNull("manual",...