Check if external app update is available

[justindg]

• Closes Check Update notifications are working and implement as required #2906

External download link is set to https://alphawallet.com/download/AlphaWallet-release-build.apk

[github-actions]

Pull reviewers stats

Stats of the last 30 days for alpha-wallet-android:

	User	Total reviews	Time to review	Total comments
	JamesSmartCell 🥇	13 ▀▀▀▀▀▀▀	12h 20m ▀▀▀▀▀▀	5 ▀▀▀▀▀▀
	seabornlee 🥈	4 ▀▀	1h 44m ▀	3 ▀▀▀▀
	justindg 🥉	1 ▀	4h 56m ▀▀▀	0

[codecov]

Codecov Report

Base: 7.64% // Head: 7.76% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (9656ed4) compared to base (9387cd0).
Patch coverage: 30.99% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##             master   #3008      +/-   ##
===========================================
+ Coverage      7.64%   7.76%   +0.11%     
- Complexity      869     890      +21     
===========================================
  Files           640     641       +1     
  Lines         43006   43081      +75     
  Branches       4330    4348      +18     
===========================================
+ Hits           3289    3344      +55     
- Misses        39439   39448       +9     
- Partials        278     289      +11     

Impacted Files	Coverage Δ
app/src/main/java/com/alphawallet/app/C.java	57.14% <ø> (ø)
...main/java/com/alphawallet/app/ui/BaseFragment.java	0.00% <0.00%> (ø)
...main/java/com/alphawallet/app/ui/HomeActivity.java	2.35% <0.00%> (-0.04%)	⬇️
...va/com/alphawallet/app/ui/NewSettingsFragment.java	0.00% <0.00%> (ø)
...a/com/alphawallet/app/viewmodel/HomeViewModel.java	29.39% <38.04%> (+6.49%)	⬆️
.../main/java/com/alphawallet/app/entity/Version.java	60.00% <60.00%> (ø)
...allet/app/walletconnect/AWWalletConnectClient.java	6.85% <0.00%> (-0.08%)	⬇️
.../java/com/alphawallet/app/widget/NFTImageView.java	0.00% <0.00%> (ø)
...om/alphawallet/app/ui/WalletConnectV2Activity.java	0.00% <0.00%> (ø)
...allet/app/walletconnect/entity/EthSignRequest.java	0.00% <0.00%> (ø)
... and 3 more

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