RP2350 - support for a 3rd PIO instance

[Makuna]

Discussed in #878

^{Originally posted by k7bbr February 20, 2025}
Thanks for adding support for the RP2040 as well as #873 adding support for 2 PIO instances. How hard would it be to add support for a 3rd PIO instance for the RP2350?

[Makuna]

https://github.com/Makuna/NeoPixelBus/releases/tag/2.8.4