Delay creation of project root EnsoFile until it is really needed

[JaroslavTulach]

Pull Request Description

Delay creation of EnsoFile until it is needed.

Important Notes

By putting breakpoint into Atom constructor I realized few EnsoProjectNode instances may be created when parsing the project. It makes no sense to also create EnsoFile for them - until it is needed.

Checklist

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

• All code follows the
  Java,
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests continue to work.

[JaroslavTulach]

I believe this PR is ready for integration. Please take a look @hubertp, @4e6.

[enso-bot]

Jaroslav Tulach reports a new STANDUP for yesterday (2023-04-03):

Progress: - integrated enso_project: #6149

• book club: https://discord.com/channels/401396655599124480/1090224103971106816/1092300902855090236
• fixing Text.to_display_text returns Text #5971 by Text.to_display_text is (shortened) identity #6174
• discovered slowness of sqrt: Numbers.sqrt & co. are slow - benchmark first #6175
• review of Context: Replace IOContexts with execution env and contexts #6171 (review)
• bug Any.== slowed down by Panic.catch 2x times #5898: 2x speedup for sieve: Always try to resolve conversion for Any type #6184
• investigating IGV graphs: If cascades 5x slower than case-of due to limit of recursive inlining #5709 (comment) It should be finished by 2023-04-03.

Next Day: Polish & integrate Any.== speedup

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