Implement Pause and Continue Mission

[andchiind]

Describe the new feature you would like to see
I would like the flotilla features of pausing and continuing missions to work with isar-exr.

Describe the solution you'd like
The following two graphql mutations can likely be used to implement this:

resumeMissionExecution(
robotID: String!
): MissionExecutionType!

pauseMissionExecution(
robotID: String!
): MissionExecutionType!

How will this feature affect the current Threat Model?
N/A

[andchiind]

See #141 and #140

[aeshub]

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