Add Alexa integration with Gladys Plus

[Pierre-Gilles]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If you are adding a new features/services, did you run integration comparator? (npm run compare-translations on front)
• Did you test this pull request in real life? With real devices? If this development is a big feature or a new service, we recommend that you provide a Docker image to the community for testing before merging.
• If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• Did you add fake requests data for the demo mode (front/src/config/demo.js) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

Please provide a description of the change here. It's always best with screenshots, so don't hesitate to add some!

[codecov]

Codecov Report

Merging #1396 (16308ca) into master (d45a7aa) will increase coverage by 0.01%.
The diff coverage is 97.54%.

@@            Coverage Diff             @@
##           master    #1396      +/-   ##
==========================================
+ Coverage   96.57%   96.59%   +0.01%     
==========================================
  Files         618      627       +9     
  Lines        8992     9155     +163     
==========================================
+ Hits         8684     8843     +159     
- Misses        308      312       +4     

Impacted Files	Coverage Δ
server/utils/constants.js	100.00% <ø> (ø)
server/services/alexa/index.js	71.42% <71.42%> (ø)
...r/lib/gateway/gateway.forwardDeviceStateToAlexa.js	94.87% <94.87%> (ø)
server/lib/gateway/gateway.handleAlexaMessage.js	100.00% <100.00%> (ø)
server/lib/gateway/gateway.handleNewMessage.js	91.42% <100.00%> (+0.51%)	⬆️
server/lib/gateway/index.js	100.00% <100.00%> (ø)
server/services/alexa/lib/alexa.onDiscovery.js	100.00% <100.00%> (ø)
server/services/alexa/lib/alexa.onExecute.js	100.00% <100.00%> (ø)
server/services/alexa/lib/alexa.onReportState.js	100.00% <100.00%> (ø)
server/services/alexa/lib/deviceMappings.js	100.00% <100.00%> (ø)
... and 3 more

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[relativeci]

Job #306: Bundle Size — 6.74MB (+0.15%).

1feac09 vs d45a7aa

Changed metrics (4/10)

Metric	Current	Baseline
Initial JS	2.86MB(+0.34%)	2.86MB
Initial CSS	294.1KB(~+0.01%)	294.08KB
Cache Invalidation	46.56%	48.33%
Modules	1171(+0.26%)	1168

Changed assets by type (2/7)

	Current	Baseline
CSS	312.03KB (~+0.01%)	312.01KB
JS	4.85MB (+0.2%)	4.84MB

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View Job #306 report on app.relative-ci.com