Testing: split ble encoder test (#2754)

test(sensors): Add mock encoder sensor

Add a new mock sensor driver for generating mock encoder sensor channel
data.

test(split): Add a peripheral sensor split test

Test BLE split logic for peripheral sensors (encoders).

app/tests/ble/split/peripheral-encoder/events.patterns

@@ -0,0 +1 @@
+s/^d_02: @[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9][0-9][0-9][0-9]  .{19}/profile 0 /p