[PoC] Remote debugger based on debugpy

[hendrikmakait]

Closes #xxxx

• Tests added / passed
• Passes pre-commit run --all-files

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    25 files   -      2      25 suites   - 2   9h 44m 18s ⏱️ - 1h 37m 52s
 4 075 tests  -     45   3 705 ✅  -    288     91 💤  -    20    278 ❌ +  263  1 🔥 ±0 
33 235 runs   - 18 439  29 894 ✅  - 19 388  1 113 💤  - 1 183  2 223 ❌ +2 134  5 🔥  - 2 

For more details on these failures and errors, see this check.

Results for commit 068f90e. ± Comparison against base commit 55bb639.

This pull request removes 47 and adds 2 tests. Note that renamed tests count towards both.

distributed.cli.tests.test_dask_scheduler
distributed.cli.tests.test_dask_ssh
distributed.dashboard.tests.test_components
distributed.dashboard.tests.test_scheduler_bokeh
distributed.dashboard.tests.test_worker_bokeh
distributed.deploy.tests.test_old_ssh
distributed.deploy.tests.test_ssh
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler_report_args[False]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler_report_args[report_args0]
…

distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---nanny]
distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---no-nanny]

This pull request removes 24 skipped tests and adds 2 skipped tests. Note that renamed tests count towards both.

distributed.cli.tests.test_dask_scheduler
distributed.cli.tests.test_dask_ssh
distributed.dashboard.tests.test_components
distributed.dashboard.tests.test_scheduler_bokeh
distributed.dashboard.tests.test_worker_bokeh
distributed.deploy.tests.test_old_ssh
distributed.deploy.tests.test_ssh
distributed.diagnostics.tests.test_progress_stream
distributed.diagnostics.tests.test_progress_widgets
distributed.protocol.tests.test_arrow
…

distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---nanny]
distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---no-nanny]

This pull request skips 2 tests.

distributed.tests.test_client ‑ test_computation_object_code_not_available
distributed.tests.test_nanny ‑ test_no_unnecessary_imports_on_worker[pandas]

♻️ This comment has been updated with latest results.