Support for generic board via PlatformDetect

[brentru]

This pull request:

• Supports the OS-agnostic board via PlatformDetect instead of using FORCE_x variables.
  • ref: https://github.com/adafruit/Adafruit_Python_PlatformDetect/pull/353
• Adds SPI, NeoPixel, and DotStar support to this board
  • Note that this work was originally in https://github.com/adafruit/Adafruit_Blinka/pull/831

Result from running pytest across this PR using the tests within tests/:

================================================================== test session starts ===================================================================
platform darwin -- Python 3.12.2, pytest-8.2.1, pluggy-1.5.0
rootdir: /Users/brentrubell/Desktop/github_brentru/Adafruit_Blinka
collected 12 items

tests/test_generic_agnostic_board_analogio.py .....                                                                                                [ 41%]
tests/test_generic_agnostic_board_digitalio.py ......                                                                                              [ 91%]
tests/test_generic_agnostic_board_i2c.py .                                                                                                         [100%]

=================================================================== 12 passed in 0.03s ===================================================================