Add disable-private-check option

[Akirathan]

Fixes #8140. Follow-up of #7840.

Pull Request Description

Adds --disable-private-check option that essentialy disables private keyword.

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[Akirathan]

So far, we only implement private modules via PrivateModuleAnalysis compiler pass, there is no runtime checking yet. Thus, this conditional adding of PrivateModuleAnalysis pass effectively disables the checks. In the future, when we will have more private stuff, like types, we will need some more sophisticated way to disable these checks. That is why the option is also in EnsoLanguage and not only in CompilerConfig.

[hubertp]

So many changes just to pass a single flag... 🤦