unify API for @babel/register, webpack, Jest etc. include/ignore and cache settings

[Domiii]

Usually, we use @babel/register for instrumentation (and thus caching). However, we cannot use @babel/register with Jest, so we need to add the corresponding settings to Jest's config instead.

• add proper include support for Jest
  • add to Jest's own transformer
  • also wrap Jest CLI call in @babel/register
  • allow the two to be configured once, without copy+pasting?
    • probably want to use ENV
  • make @babel/register/lib/node.js's configFile: false configurable
    • -> or, in case of Jest, change babel.config.js to only add @dbux/babel-plugin if not already added
      • -> or change @dbux/cli/src/buildBabelOptions to not add it instead
    • also, change Jest's babel.config.js, s.t. @dbux/babel-plugin is not added if DBUX is disabled
    • because else, the config file would add @dbux/babel-plugin a second time when read from register
  • add more finely grained config options for module path include/ignore to moduleFilter
    • because we want to disable (not just packages, but) specific files, such as jest-runner/build/requireOrImportModule.js etc.
• add cache support for Jest
  • see: https://jestjs.io/docs/configuration#cachedirectory-string
• generalize cache management
  • ProjectManager: getCacheRoot, getCacheFolder
  • add cache management for Jest
    • also related to: improve dbux-projects webpack'ing #615
• test w/ javascript-algorithms