[SDL 0177] Alert icon

[bilal-alsharifi]

Fixes #795

This PR is ready for review.

Risk

This PR makes minor API changes.

Testing Plan

Unit tests have been updated to test the new alertIcon param

Summary

• Add new alertIcon param to the alert RPC

CLA

• I have signed the CLA

[codecov-io]

Codecov Report

Merging #1112 into develop will decrease coverage by 2.14%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop    #1112      +/-   ##
=============================================
- Coverage       46.8%   44.66%   -2.15%     
- Complexity      4015     4089      +74     
=============================================
  Files            453      455       +2     
  Lines          22156    23672    +1516     
  Branches        2513     2745     +232     
=============================================
+ Hits           10371    10572     +201     
- Misses         11174    12481    +1307     
- Partials         611      619       +8

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/smartdevicelink/proxy/rpc/Alert.java	100% <100%> (ø)	20 <2> (+2)	⬆️
...martdevicelink/proxy/rpc/enums/ImageFieldName.java	100% <100%> (ø)	2 <0> (ø)	⬇️
...smartdevicelink/encoder/VirtualDisplayEncoder.java	24.43% <0%> (-4.55%)	8% <0%> (ø)
...ers/screen/choiceset/PresentKeyboardOperation.java	13.9% <0%> (-0.99%)	3% <0%> (+1%)
...n/java/com/smartdevicelink/proxy/SdlProxyBase.java	7.54% <0%> (-0.87%)	37% <0%> (+10%)
...java/com/smartdevicelink/managers/ProxyBridge.java	3.22% <0%> (-0.84%)	2% <0%> (ø)
...com/smartdevicelink/protocol/enums/FunctionID.java	93.79% <0%> (-0.01%)	16% <0%> (+4%)
...om/smartdevicelink/proxy/rpc/enums/ButtonName.java	100% <0%> (ø)	27% <0%> (+13%)	⬆️
...om/smartdevicelink/proxy/rpc/MediaServiceData.java	100% <0%> (ø)	49% <0%> (+23%)	⬆️
...m/smartdevicelink/proxy/rpc/PublishAppService.java	100% <0%> (ø)	7% <0%> (+2%)	⬆️
... and 4 more

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