Configuable temperature limits for Cold Chain

[jmbrunskill]

Is your feature request related to a problem? Please describe

Usually cold chain notification should use standardise limits for temperature limits between 2-8 degrees C

However for testing and other possible use cases, configurable limits would be useful

Describe the solution you'd like

The default 2 - 8 limit should be on by default, but give the user an option to update/change these limits if they will

Acceptance Criteria

• defaults are visible and easy to configure
• custom limits can be specified (for all sensors in the config)
• Update i icon messages to explain the default limits

Describe alternatives you've considered

• Update mSupply & coldchain apps to store & sync an excursion limit (rather than breach limits)
• Some kind of default limits specified in the server config?

Additional context

Breach limits may not be synced to mSupply (apparently)
Breach limits are setup to have a duration (not a single excusion alarm)