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load_cell: Load cell gram scale (#6729)

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* Add gram scale features to load_cell
* Convert sensor counts to grams and make this available via unix socket and object status
* Basic GCodes for tearing and reading the load cell
* Guided Calibration
* Diagnostic gcode to check the health of the load cell
* Update load_cell Documentation
* Add API server load_cell/dump_force endpoint
* Update [load_cell] config with calibration fields
* Add G-Code commands for working with load cells
* Add status reference for load_cell objects

Signed-off-by: Gareth Farrington <gareth@waves.ky>
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@ -364,37 +364,21 @@ and might later produce asynchronous messages such as:
The "header" field in the initial query response is used to describe
the fields found in later "data" responses.
### hx71x/dump_hx71x
### load_cell/dump_force
This endpoint is used to subscribe to raw HX711 and HX717 ADC data.
Obtaining these low-level ADC updates may be useful for diagnostic
and debugging purposes. Using this endpoint may increase Klipper's
system load.
This endpoint is used to subscribe to force data produced by a load_cell.
Using this endpoint may increase Klipper's system load.
A request may look like:
`{"id": 123, "method":"hx71x/dump_hx71x",
`{"id": 123, "method":"load_cell/dump_force",
"params": {"sensor": "load_cell", "response_template": {}}}`
and might return:
`{"id": 123,"result":{"header":["time","counts","value"]}}`
`{"id": 123,"result":{"header":["time", "force (g)", "counts", "tare_counts"]}}`
and might later produce asynchronous messages such as:
`{"params":{"data":[[3292.432935, 562534, 0.067059278],
[3292.4394937, 5625322, 0.670590639]]}}`
`{"params":{"data":[[3292.432935, 40.65, 562534, -234467]]}}`
### ads1220/dump_ads1220
This endpoint is used to subscribe to raw ADS1220 ADC data.
Obtaining these low-level ADC updates may be useful for diagnostic
and debugging purposes. Using this endpoint may increase Klipper's
system load.
A request may look like:
`{"id": 123, "method":"ads1220/dump_ads1220",
"params": {"sensor": "load_cell", "response_template": {}}}`
and might return:
`{"id": 123,"result":{"header":["time","counts","value"]}}`
and might later produce asynchronous messages such as:
`{"params":{"data":[[3292.432935, 562534, 0.067059278],
[3292.4394937, 5625322, 0.670590639]]}}`
The "header" field in the initial query response is used to describe
the fields found in later "data" responses.
### pause_resume/cancel