Restore batch mode compiler support for dartk and dartkp configurations

[mraleph]

Currently we use kernel isolate in all dartk and non-strong dartkp modes. This allows us to compile to Kernel transparently, but leads to a lot of issues and bad performance of tests especially in simulated architectures (40x slower tests on SIMARM+dartk configuration) and precompiler mode.

Plan:

• Restore pure batch mode support: run persistent compiler runner in background, compile to dill files on disk, pass those to the VM.
• Switch dartkp on all architectures to this mode.
• Switch dartk on SIM* architectures to use this mode.

Some tests that need to perform on the fly compilation (Isolate and reload tests) would continue to use --dfe for now.

[mraleph]

/cc @alexmarkov @a-siva

[mkustermann]

Enabled in -cdartkp --strong in 8c38a41

[alan-knight]

The CL caused regressions, talked to Martin and reverted it in https://dart.googlesource.com/sdk/+/af0b27480a30bea4c87ab34b8d4f712319fcd3f5

[mkustermann]

A re-land of that CL is in-progress and more CLs are in preparation.