Publish last reset event on session resumption

[monkbroc]

Problem

When the device reboots and resumes its session (for example after System.reset() and after pin reset on Gen 3), the spark/device/last_reset event is not published. It's only published when a new session is established.

Solution

Publish last reset reason whenever the first cloud connection is established, regardless if it's a new session or a resumed session.

Note: there's a lot of duplication in if (!session_resumed) part of Spark_Handshake and it's not clear if additional things in the if should also be done in the else. Please think about this as part of the review for this PR.

Steps to Test

Ensure a spark/device/last_reset is published in the following conditions

• Power on reset
• Pin reset (check Gen 3 & Gen 4)
• particle usb reset

Example App

When device resets from System.reset(), spark/device/last_reset with data user should be published.

void setup()
{
   System.enable(SYSTEM_FLAG_PUBLISH_RESET_INFO);
   System.enableFeature(FEATURE_RESET_INFO);
}
void loop()
{
  if (Particle.connected()) {
        delay(10000);
        System.reset();
  }
}

References

https://app.shortcut.com/particle/story/128022/publish-last-reset-event-on-session-resumption

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)

[eberseth]

@monkbroc Could you rebase this onto develop?