Introduce common IR backend plugin (1/2)

[Mr3zee]

Subsystem Compiler plugins, KSP

Problem Description We want to get rid of KSP plugin replacing it entirely with KCP.

Solution Solution consists of 5 steps (checked tasks are done at the time of this request):

• [ ] Introduce common IR backend plugin
• [ ] Introduce K2 FIR plugin
• [ ] Introduce K1 frontend plugin
• [ ] Add KCP tests
• [ ] Remove KSP plugin

This is Part 1 of 2 of introducing IR plugin, with utility changes Link to Part2: https://github.com/ktorio/krpc/pull/45

[Mr3zee]

Please consider adding unit tests for compatibility transformations and string manipulations to catch the breaking changes quick

We have ProtocolTest that fails if this happens

[e5l]

yep, but this is a sort of integration tests

[Mr3zee]

Yeah, you're right I'll keep that in mind when dealing with new protocol impl, as it somewhere around the corner already