ESP32-S3 BLE fixes

[dhalbert]

Fixes #8631.

Seems to fix ESP32-S3 BLE acting as a simple central. See https://forums.adafruit.com/viewtopic.php?t=206024 for user problems. I will point the users in that thread to the artifacts once this has built.

Tested on a BerryMed Pulse Oximeter with the library's simpletest.

Notes:

• QTPY ESP32S3 9.0.0A5: fails on BLERadio startScan() #8631 fix fixes a problem exposed by the new split heap use.
• BLE_ERR_SUCCESS is 0, but was being used in places where the return values are actually BLE_HS_*. Nimble has multiple sets of error return codes, but no corresponding types, so it's hard to figure out which codes to use where. BLE_HS_* values don't have a zero BLE_HS_OK or BLE_HS_SUCCESS, unfortunately.
• Fixed some apparent missing returns in error cases.
• common_hal_bleio_characteristic_set_value() was being used to set a remote Characteristic value during discovery, but this did not work.
• An initial value should have been passed as a bufinfo, but was not.

There may be other problems, and the functionality is still limited in several ways. But this seems to fix some basic issues that were holding up using ESP32-S3 BLE as a central.

[jepler]

Nothing obviously wrong, and user tests show it improves status quo. Thanks!