Lora region preset map (#10736)

* Added lora region and preset maps

* Protos

* Address PR review feedback

- Log (and break/skip) when the region preset map exceeds its array bounds
  instead of silently dropping regions
- Derive test bounds from the generated nanopb array sizes via sizeof()
  instead of hard-coded magic numbers
- Fix want_config sequence comment (missing comma, STATE_SEND_MODULECONFIG)
- Specify a language on the spec's fenced code blocks (markdownlint MD040)

* Fix want_config stall: handle STATE_SEND_REGION_PRESETS in PhoneAPI::available()

available() had a separate per-state switch that wasn't updated for the new
state, so it returned false ('unexpected state 5') and getFromRadio() was
never called - the config handshake stalled after metadata and the client
timed out. Verified via the native simulator integration test.

src/mesh/PhoneAPI.h

@@ -46,6 +46,7 @@ class PhoneAPI
         STATE_SEND_MY_INFO, // send our my info record
         STATE_SEND_OWN_NODEINFO,
         STATE_SEND_METADATA,
+        STATE_SEND_REGION_PRESETS,  // Send the region->valid-preset map (one message)
         STATE_SEND_CHANNELS,        // Send all channels
         STATE_SEND_CONFIG,          // Replacement for the old Radioconfig
         STATE_SEND_MODULECONFIG,    // Send Module specific config