Update the GATT client to allow use of Write Without Response characteristics

[Meigs2]

Summary

Some BLE devices expose the attribute "Write Without Response" on characteristics. Currently, trouble only supports writing with responses. This PR extends the GATT client to support Write Without Response.

Implementation

According to the BLE Spec regarding Write Without Response, the end of section 3.4.5.3 reads:

No ATT_ERROR_RSP or ATT_WRITE_RSP PDUs shall be sent in response to this command. If the server cannot write this attribute for any reason the command shall be ignored

Therefore, we should be able to re-use existing logic in the request method for the GATT client to send the message, and not wait on a response from the response_channel.

I've added a new method, write_characteristic_without_response which invokes this new Write command process

Testing

I've tested this on an Acaia Lunar 2021 which exposes a Write Without Response characteristic, writing to this before would cause an WRITE_NOT_PERMITTED = 0x03 error code from the host layer. Utilizing the new method allows me keep a long-lived connection open with the scale. This was tested on an ESP32C3 dev board.

[lulf]

LGTM, thanks for fixing!

[lulf]

/test