Feature/sc 121837/support local flash without internet access

[hugomontero]

Description

This PR will allow the use of flashing device os offline.
When the user downloads an specific device os version it will be cached in a file, then if the user tries to download it again without internet access, then the cli will looks into the cached file to try to flash the device.

How to Test

1. Pull down the branch: git pull && git checkout feature/sc-121837/support-local-flash-without-internet-access
2. Install dependencies: npm i
3. Run tests: npm test
4. Attempt to run steps with internet access
5. Attempt to run steps without internet access
6. Remove the device-os-version-cached.json from ~/.particle/device-os-flash/binaries
7. Attempt to run steps without internet access
8. Re-run step 4
9. Delete the binaries from ~/.particle/device-os-flash/binaries/${version}/${platform}
10. Attempt to run steps without internet access

Steps with internet access:

• Update your device to:
  • latest: npm start -- update
  • specific target: npm start -- update --target 5.0.0

Steps Without internet access

• Disconnect the client from internet
• Update your device to:
  • latest: npm start -- update
  • specific target: npm start -- update --target 5.0.0

outcome

• Tests should pass
• Steps 4 and 5 should flash the device without issues and should create a new file in ~/.particle/device-os-flash/binaries named device-os-version-cached.json
• Step 7 and 10 should show a message indicating: Device OS version not found in cache for platform: ${platformId} version: ${version} and there was an internet connection error

Related Issues / Discussions

Story details 👉 https://app.shortcut.com/particle/story/121837/support-local-flash-without-internet-access

Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA
• Problem and solution clearly stated
• Tests have been provided
• Docs have been updated
• CI is passing

[monkbroc]

I tested it. It works great now and we have a repeatable pattern for offline usage of the API!