gh-135645: Added supports_isolated_interpreters to sys.implementation

[sobolevn]

• Issue: 3.14: missing sys.implementation.supports_isolated_interpreters? #135645

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📚 Documentation preview 📚: https://cpython-previews--135667.org.readthedocs.build/

[vstinner]

LGTM

[sobolevn]

Thank you, @vstinner! I would like to get a review from:

• @ericsnowcurrently as a code-owner
• and from @hugovk as the RM, because this is techincally a feature, and now it is a feature freeze

[vstinner]

and from @hugovk as the RM, because this is techincally a feature, and now it is a feature freeze

PEP 734 got an exception to be added to Python 3.14 after the feature freeze, no?

[bedevere-app]

When you're done making the requested changes, leave the comment: I have made the requested changes; please review again.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @sobolevn for commit 028b498 🤖

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[ericsnowcurrently]

LGTM

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @sobolevn for commit 5fe139c 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F135667%2Fmerge

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.