Addition to powergrid model api to insert measurements

[tdtalbot]

Description

Added methods to the API to automatically insert measurements
To test this, send a request to the topic goss.gridappsd.process.request.data.powergridmodel

with the json:
{
"requestType": "INSERT_ALL_MEASUREMENTS",
"resultFormat": "JSON"
}

or:
{
"requestType": "DROP_ALL_MEASUREMENTS",
"resultFormat": "JSON"
}

We should probably have a conversation about how to set up some automated tests for this. At this time I only allow users to insert or drop measurements for all model through the api, but could add model specific calls as well if it is wanted.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• [ X] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update