Add Detailed Charge State field

[agbpatro]

Description

Adding a detailed charge state in the payload
If the value is present in string, convert into respective enum

Fixes # (issue)
#123

Type of change

Please select all options that apply to this change:

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change which fixes an issue)
• Documentation update

Checklist:

Confirm you have completed the following steps:

• My code follows the style of this project.
• I have performed a self-review of my code.
• I have made corresponding updates to the documentation.
• I have added/updated unit tests to cover my changes.
• I have added/updated integration tests to cover my changes.

[jbanyer]

FYI I tried to use this new field, however when I attempt to reference this field in a vehicle configuration (POST /api/1/vehicles/fleet_telemetry_config) I receive the following error:

{
  response: null,
  error: 'Unknown field DetailedChargeState',
  error_description: '',
  txid: 'd4cd7d67edf5e099f0f4e46d7e7af102'
}

[bramp]

The comment is slightly incorrect, "parses a location", should be "parses a charge state string"....

[stx]

@agbpatro Any ETA on this? Super important field.

[patrickdemers6]

Closing this as it's addressed in #206. Vehicles will be capable of sending this field in a future firmware release.