Aw/move packages to src

[AleksanderWWW]

Part of NPT-12415

• moved neptune and neptune_cli to src
• adjusted setup.py (package_dir and find_packages)

[github-actions]

Test Results

    2 files   -     8      2 suites   - 8   1m 39s ⏱️ - 2h 1m 20s
477 tests  -   11  477 ✔️  -     8  0 💤  -   3  0 ❌ ±0 
954 runs   - 346  954 ✔️  - 331  0 💤  - 15  0 ❌ ±0 

Results for commit 33ff994. ± Comparison against base commit ed01fe0.

This pull request removes 488 and adds 477 tests. Note that renamed tests count towards both.

integrations.test_huggingface.TestHuggingFace ‑ test_every_train_should_create_new_run
integrations.test_huggingface.TestHuggingFace ‑ test_hyperparameter_optimization
integrations.test_huggingface.TestHuggingFace ‑ test_initialization_with_run_provided
integrations.test_huggingface.TestHuggingFace ‑ test_integration_version_is_logged
integrations.test_huggingface.TestHuggingFace ‑ test_log_parameters_disabled
integrations.test_huggingface.TestHuggingFace ‑ test_log_parameters_with_base_namespace
integrations.test_huggingface.TestHuggingFace ‑ test_log_with_custom_base_namespace
integrations.test_huggingface.TestHuggingFace ‑ test_model_checkpoints_best[checkpoint_settings0]
integrations.test_huggingface.TestHuggingFace ‑ test_model_checkpoints_best[checkpoint_settings1]
integrations.test_huggingface.TestHuggingFace ‑ test_model_checkpoints_best[checkpoint_settings2]
…

tests.neptune.alpha_integration.test_alpha_integration_backend.TestAlphaIntegrationNeptuneBackend ‑ test_send_channels_image_values
tests.neptune.alpha_integration.test_alpha_integration_backend.TestAlphaIntegrationNeptuneBackend ‑ test_send_channels_numeric_values
tests.neptune.alpha_integration.test_alpha_integration_backend.TestAlphaIntegrationNeptuneBackend ‑ test_send_channels_text_values
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_cannot_resolve_host
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_deprecated_token
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_max_compatible_version_fail
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_max_compatible_version_ok
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_min_compatible_version_fail
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_min_compatible_version_ok
tests.neptune.internal.backends.test_hosted_neptune_backend.TestHostedNeptuneBackend ‑ test_should_accept_given_api_token
…

♻️ This comment has been updated with latest results.