Lincheck benchmarks

[eupp]

This PR adds benchmarking infrastructure to the Lincheck. It includes:

• API to track progress of lincheck test run: LincheckRunTracker interface.
• Statistics gathering infrastructure based on LincheckRunTracker API.
• New gradle tasks to run benchmarks (tests and benchmarks are put into separate source sets).
• Several benchmarks for standard concurrent data structures and synchronization primitives.
• Script to draw various plots based on collected benchmark statistics (using Lets-Plot Kotlin library).

[eupp]

Hi @ndkoval ! I've rebased this PR on develop and fixed all previous review comments. Please have a look.