class ClockDriver

Generates Inspect data for power observability. This intends to match the exact format generated

by the library at `//sdk/lib/power/state_recorder` which will allow us to use the same tooling.

The reason for not using that library currently is that it stores all live data directly in the

inspect library instead of populating it lazily. That causes it to use too much memory and limits

the history we get out of it. This instead uses a space efficient storage that it can convert

into the inspect format when needed.

The data is structured as follows:

{

"power_observability_state_recorders": {

"clock_rates:<name_or_id>:0x<id>": {

"metadata": {

"name": "clock_rate",

"type": "numeric",

"units": "hz",

"range": {

"min_inc":

<minimum

rate across all clocks>,

"max_inc":

<maximum

rate across all clocks>

}

},

"history": {

"0": { "@time":

<timestamp

>, "value":

<rate

in Hz> },

"1": { "@time":

<timestamp

>, "value":

<rate

in Hz> },

...

}

},

"clock_states:<name_or_id>:0x<id>": {

"metadata": {

"name": "clock_state",

"type": "enum",

"states": {

"disabled": 0,

"enabled": 1

}

},

"history": {

"0": { "@time":

<timestamp

>, "value":

<

0 or 1> },

"1": { "@time":

<timestamp

>, "value":

<

0 or 1> },

...

}

},

...

}

}