Adds the whoami/me command

[chrisguidry]

This also backfills the test suite for the whole auth module, to
100% coverage.

$ prefect-cloud whoami
                         User                         
┌─────────┬──────────────────────────────────────────┐
│ Name    │ Chris Guidry                             │
│ Email   │ [email protected]                       │
│ Handle  │ chrisgprefectio                          │
│ ID      │ 2ee633f5-a8a1-4367-bd09-cbc329b1622a     │
│ API Key │ pnu_********************************XEHJ │
└─────────┴──────────────────────────────────────────┘

                                               Accounts and Workspaces                                                
┏━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Account                 ┃ Handle                                            ┃ ID                                   ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┩
│ chrisgprefectio         │ chrisgprefectio                                   │ b9b0sfasfdd-1d72-4200-b329-d4332814dc74 │
└─────────────────────────┴───────────────────────────────────────────────────┴──────────────────────────────────────┘

$ pytest --cov --cov-report term-missing
=================================================================== test session starts ====================================================================
platform linux -- Python 3.12.8, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/chris/src/github.com/PrefectHQ/prefect-cloud
configfile: pyproject.toml
testpaths: tests
plugins: cov-6.0.0, respx-0.22.0, anyio-4.8.0, asyncio-0.25.3, time-machine-2.16.0, xdist-3.6.1
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope=session
collected 55 items                                                                                                                                         

tests/test_auth.py .........................                                                                                                         [ 45%]
tests/test_auth_interactive.py .....                                                                                                                 [ 54%]
tests/test_auth_profiles.py ........................                                                                                                 [ 98%]
tests/test_the_tests.py .                                                                                                                            [100%]

---------- coverage: platform linux, python 3.12.8-final-0 -----------
Name                                      Stmts   Miss  Cover   Missing
-----------------------------------------------------------------------
src/prefect_cloud/__init__.py                 0      0   100%
src/prefect_cloud/auth.py                   209      0   100%
src/prefect_cloud/utilities/__init__.py       0      0   100%
src/prefect_cloud/utilities/tui.py           42     35    17%   10-12, 29-80
tests/__init__.py                             0      0   100%
tests/conftest.py                            15      0   100%
tests/test_auth.py                          130      0   100%
tests/test_auth_interactive.py               56      0   100%
tests/test_auth_profiles.py                 120      0   100%
tests/test_the_tests.py                       2      0   100%
-----------------------------------------------------------------------
TOTAL                                       574     35    94%


==================================================================== 55 passed in 1.03s ====================================================================

Part of ENG-1067

[linear]

ENG-1067 make `prefect cloud` cli command an alias to `prefect-cloud` (migrate commands too)

[jakekaplan]

Probably need a .gitignore for this unless it was intentional?

[chrisguidry]

Why? This is where we'd tell the LLMs our coding style, which I think we'd want to share across devs on the project?

[jakekaplan]

works for me! just wasn't sure