To ensure we can tune things when other threads may have priority,
preventing UART processing in time for the studio UI requirements,
adjust our default UART thread priority, and allow overriding as needed.
* UART and BLE/GATT transports for a protobuf encoded RPC
request/response protocol.
* Custom framing protocol is used to frame a give message.
* Requests/responses are divided into major "subsystems" which
handle requests and create response messages.
* Notification support, including mapping local events to RPC
notifications by a given subsystem.
* Meta responses for "no response" and "unlock needed".
* Initial basic lock state support in a new core section, and allow specifying
if a given RPC callback requires unlocked state or not.
* Add behavior subsystem with full metadata support and examples of
using callback to serialize a repeated field without extra stack space needed.
Co-authored-by: Cem Aksoylar <caksoylar@users.noreply.github.com>
