Bottom navbar UI

[MattLichtenstein]

Description

• Introduces a Bottom navigation bar to the UI
• New PR for https://github.com/mozilla-mobile/mozilla-vpn-client/pull/4072 since I messed the last one up

Reference

VPN-2487: Create custom navigation tab bar component

Checklist

• [ ] My code follows the style guidelines for this project
• [ ] I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• [ ] I have performed a self review of my own code
• [ ] I have commented my code PARTICULARLY in hard to understand areas
• [ ] I have added thorough tests where needed

[codecov-commenter]

Codecov Report

Merging #4177 (f955ade) into main (4742832) will increase coverage by 0.12%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4177      +/-   ##
==========================================
+ Coverage   28.82%   28.94%   +0.12%     
==========================================
  Files         217      213       -4     
  Lines       12354    11931     -423     
  Branches     7007     6817     -190     
==========================================
- Hits         3561     3454     -107     
+ Misses       3735     3537     -198     
+ Partials     5058     4940     -118     

Flag	Coverage Δ
lottie_tests	56.33% <ø> (ø)
qml_tests	11.05% <ø> (-0.16%)	:arrow_down:
unit_tests	27.49% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/filterproxymodel.cpp	41.66% <0.00%> (-12.02%)	:arrow_down:
tests/qml/helper.cpp	79.48% <0.00%> (-9.41%)	:arrow_down:
tests/qml/mocmozillavpn.cpp	14.77% <0.00%> (-7.45%)	:arrow_down:
src/theme.cpp	42.52% <0.00%> (-3.31%)	:arrow_down:
src/closeeventhandler.cpp	20.00% <0.00%> (-2.23%)	:arrow_down:
src/loghandler.cpp	41.37% <0.00%> (-1.41%)	:arrow_down:
src/theme.h	100.00% <0.00%> (ø)
src/settingslist.h	0.00% <0.00%> (ø)
src/update/webupdater.cpp	0.00% <0.00%> (ø)
tests/qml/moccontroller.cpp	0.00% <0.00%> (ø)
... and 24 more

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