Improve sample projects

[qurbonzoda]

Sample projects are meant to showcase the library features and possible configurations. Current example projects do not cover all of them.

Introduce sample projects for:

• Kotlin Mutiplatform project where the benchmark code is within the main compilation of Kotlin targets
• Kotlin Mutiplatform project where the benchmark code is separated from the main compilation of Kotlin targets
• Kotlin/JVM and Java projects where the benchmark code is within the main source set of the project
• Kotlin/JVM and Java projects where the benchmark code is separated from the main source set of the project
• Kotlin Mutiplatform project where Kotlin/JS or Wasm benchmarks are executed with the built-in executor
• Kotlin Mutiplatform, Kotlin/JVM and Java projects where jmhVersion is specified, including with benchmarks_jmh_version project property.
• Configure the main configuration profile to demonstrate:
  • Options override annotations in benchmark code
  • Time unit string formats supported
  • Benchmark mode option impact
  • reportFormat option usage and the reports of different formats
  • param option usage
  • advanced option usage
• Create and configure additional configuration profiles
  • Include and exclude benchmarks

The introduced samples should:

• Document what does the project demonstrates
• Document relevant tasks the kotlinx-benchmark plugin creates
• Use Kotlin DSL in the Gradle build script

Make sure to reference those project from the relevant guides.