fix(demo): switch adapter based on defines, add PICO_CYW43_SUPPORTED

[tyeth]

Currently you cannot build using platformio offline mode for Wi-Fi and non Wi-Fi adapters without manually changing the code base.

This PR facilitates not having to do that by checking suitable network defines on Wi-Fi enabled boards, and then picking the WiFi or non WiFi adapter.

Found issue moving between Pico2w and metroRP2350 when testing the sleep mode PR.

The CYW43 included with pico and rm2 modules has a specific define that we can track too, so the network adaptor has been augmented with this.

[brentru]

@tyeth Please add more information into this PR such as:

• What problem does this solve, exactly?
• Behavior before the define (you can describe it, logs are optional)
• Behavior after the define inclusion

[tyeth]

@tyeth Please add more information into this PR such as:

• What problem does this solve, exactly?
• Behavior before the define (you can describe it, logs are optional)
• Behavior after the define inclusion

👍 Done

[brentru]

@tyeth Perfect explanation, approved. This is currently a draft, please merge in as soon as you test so we can merge the main PR.