Refactoring build scripts

[dkrasnoff]

• move plugin and dependency repositories to settings file
• change files from gradle to gradle convention plugins 1 by 1
• remove usages of allprojects block
• remove usages of subprojects block
• build.gradle -> build.gradle.kts
• update targets
• remove deprecated things like buildDir
• reduce 3 ways of overriding Kotlin version (see Moved all the dependencies version to version catalog #418 (comment))
• de-duplicate the version override in the actual project and in buildSrc (see Moved all the dependencies version to version catalog #418 (comment))
• move to Gradle 8.7
• enable Configuration Cache
• enable Build Cache
• remote Build Cache (CI)
• Build scans
• Use cache-redirector

[dkrasnoff]

For test suits I've created separate issue: #457