Federation Data Exchange for FE2

[quadcopterman]

Here is the implementation of the data exchange protocol for FE2 Android. The data exchange protocol is defined in issue #1802

[github-actions[bot]]

Pull reviewers stats

Stats of the last 30 days for popstellar:		User	Total reviews	Time to review	Total comments
	K1li4nL 🥇	18 ▀▀▀▀▀	1d 20h 18m)) ▀▀▀	13 ▀▀▀
	arnauds5 🥈	5 ▀	7h))	4 ▀
	emonnin-epfl 🥉	4 ▀	8h 20m)) ▀	8 ▀▀
	onsriahi14	3 ▀	1d 6h 22m)) ▀▀	4 ▀
	MariemBaccari	2 ▀	22h 39m)) ▀▀	6 ▀
	simone-kalbermatter	2 ▀	5h 32m))	0
	matteosz	2 ▀	1d 5h 29m)) ▀▀	3 ▀
	sgueissa	1	49m))	3 ▀

^{⚡️ Pull request stats}

[sonarcloud[bot]]

Quality Gate passed for 'PoP - PoPCHA-Web-Client'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'PoP - Be2-Scala'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'PoP - Be1-Go'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate passed for 'PoP - Fe2-Android'

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
70.3% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud