Screen UI (part I)

[fmontesino]

Please note this is not the final UI and everything is due to be changed. I just felt this PR was getting big enough already and I am still waiting for more designs.

Why?

We have the first draft of the design, so it's a good time to start implementing some UI features.

What?

• Add basic screen UI, including showing the last used proxy.
• Show an information dialog about uninstalling the app warnings.
• Add error handling for incorrect input data
• Setup the proxy with the user's input data

Bonus

Added some more proxy validation rules. Some screenshots:

[codecov-commenter]

Codecov Report

Merging #15 into main will decrease coverage by 6.13%. The diff coverage is 4.25%.

@@             Coverage Diff              @@
##               main      #15      +/-   ##
============================================
- Coverage     40.11%   33.98%   -6.14%     
- Complexity       35       38       +3     
============================================
  Files            16       16              
  Lines           172      206      +34     
  Branches         14       23       +9     
============================================
+ Hits             69       70       +1     
- Misses          102      135      +33     
  Partials          1        1              

Impacted Files	Coverage Δ	Complexity Δ
...oggle/feature/manager/view/ProxyManagerFragment.kt	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...inandcarta/create/proxytoggle/view/MainActivity.kt	6.66% <ø> (+0.41%)	0.00 <0.00> (ø)
...carta/create/proxytoggle/android/ProxyValidator.kt	100.00% <100.00%> (ø)	7.00 <5.00> (+2.00)
...feature/manager/viewmodel/ProxyManagerViewModel.kt	100.00% <100.00%> (ø)	8.00 <1.00> (+1.00)