pip install library_name -t /volumes/CircuitPython/lib/ installs blinka and core modules

No good to place to open this really, so putting in circup for discussion.

Now that all libraries are available on PyPi, you can install libraries with pip.
ex: `pip install adafruit_circuitpython -t /volumes/CircuitPython/lib/`

Issues with this :
1. You don't get the .mpy version
2. You also get Blinka and core modules

I believe this was done to support Thonny.
Dos Thonny also install the .py version? Does it ignore the Blinka dependencies (like circup does)?

```bash
pip install adafruit_circuitpython_requests -t /Volumes/CIRCUITPY/lib/
Collecting adafruit_circuitpython_requests
Using cached adafruit-circuitpython-requests-1.12.4.tar.gz (42 kB)
Preparing metadata (setup.py) ... done
Collecting Adafruit-Blinka
Using cached Adafruit-Blinka-8.1.0.tar.gz (190 kB)
Preparing metadata (setup.py) ... done
Collecting Adafruit-PlatformDetect>=3.13.0
Using cached Adafruit-PlatformDetect-3.26.0.tar.gz (40 kB)
Preparing metadata (setup.py) ... done
Collecting Adafruit-PureIO>=1.1.7
Using cached Adafruit_PureIO-1.1.9-py3-none-any.whl
Collecting pyftdi>=0.40.0
Using cached pyftdi-0.54.0-py3-none-any.whl (144 kB)
Collecting adafruit-circuitpython-typing
Using cached adafruit_circuitpython_typing-1.7.1-py3-none-any.whl
Collecting pyserial>=3.0
Using cached pyserial-3.5-py2.py3-none-any.whl (90 kB)
Collecting pyusb!=1.2.0,>=1.0.0
Using cached pyusb-1.2.1-py3-none-any.whl (58 kB)
Collecting adafruit-circuitpython-busdevice
Using cached adafruit_circuitpython_busdevice-5.1.10-py3-none-any.whl
Using legacy 'setup.py install' for adafruit_circuitpython_requests, since package 'wheel' is not installed.
Using legacy 'setup.py install' for Adafruit-Blinka, since package 'wheel' is not installed.
Using legacy 'setup.py install' for Adafruit-PlatformDetect, since package 'wheel' is not installed.
Installing collected packages: pyserial, pyusb, Adafruit-PureIO, Adafruit-PlatformDetect, pyftdi, adafruit-circuitpython-busdevice, adafruit-circuitpython-typing, Adafruit-Blinka, adafruit_circuitpython_requests
Running setup.py install for Adafruit-PlatformDetect ... done
Running setup.py install for Adafruit-Blinka ... done
Running setup.py install for adafruit_circuitpython_requests ... done
Successfully installed Adafruit-Blinka-8.1.0 Adafruit-PlatformDetect-3.26.0 Adafruit-PureIO-1.1.9 adafruit-circuitpython-busdevice-5.1.10 adafruit-circuitpython-typing-1.7.1 adafruit_circuitpython_requests-1.12.4 pyftdi-0.54.0 pyserial-3.5 pyusb-1.2.1

ls /Volumes/CIRCUITPY/lib

Adafruit_Blinka-8.1.0-py3.9.egg-info circuitpython_typing
Adafruit_PlatformDetect-3.26.0-py3.9.egg-info digitalio.py
Adafruit_PureIO keypad.py
Adafruit_PureIO-1.1.9.dist-info microcontroller
__pycache__ micropython.py
adafruit_blinka neopixel_write.py
adafruit_bus_device onewireio.py
adafruit_circuitpython_busdevice-5.1.10.dist-info pulseio.py
adafruit_circuitpython_requests-1.12.4-py3.9.egg-info pwmio.py
adafruit_circuitpython_typing-1.7.1.dist-info pyftdi
adafruit_platformdetect pyftdi-0.54.0.dist-info
adafruit_requests.py pyserial-3.5.dist-info
analogio.py pyusb-1.2.1.dist-info
bin rainbowio.py
bitbangio.py serial
board.py usb
busio.py usb_hid.py
```

Reproduce the documented `pip install adafruit_circuitpython_requests -t /Volumes/CIRCUITPY/lib/` command and inspect the resulting files listed in the issue. Determine whether Thonny and circup treat `.py`, `.mpy`, Blinka, and core modules differently; done means the expected installation behavior and an actionable change are clearly defined.

Written by the indexing model from the issue text.