The current compilerArtefacts plugin's existing methods had two flaws:
1. It wasn't possible to get all Compiler Abstracts available in one go.
2. It was possible to first get all files with `getAllContractsData` and then call each CompilerAbstract one by one with `getCompilerAbstract`, however, in that case the CompilerAbstract was missing the `input` because it wasn't passed to the contructor and saveCompilationPerFileResult. It was only done so for the `solidityUnitTesting` plugin listener.

The compiler input is needed for consistent contract verification. While it's possible to generate a compiler input from the contract artefact, via the metadata, it is not always possible to get a match due to known bugs in compiler's AST generation in prev. versions. This results in different bytecode from the original compiler input's output vs the compilation output from the metadata file.