Original `ComponentRegistrar` exposes Project to its registration method,
so plugins should manually register extensions to it. To prepare for
possible unbound compiler from Project API in future new `K2ComponentRegistrar`
introduced which provides registration method without Project at all
* kotlinx.atomicfu compiler plugin for JS_IR
Support transformations of atomic operations introduced by the kotlinx.atomicfu library for the JS_IR backend. Compiler plugin is applied externally by the kotlinx.atomicfu gradle plugin.
* Apply compiler plugin for JS platform only
* New plugin test structure
* testGroupOutputDirPrefix changed