feat(avatar): adds color prop and test case for it

[yurisldk]

1. Adds color property to Avatar component to change image ring color. Works only if border property is true.
2. Adds 'color' test case to the Avatar`s Theme test case

#409

Description

Implements avatar component enhancement introduced by @tiagossa1 The component has ability to change image ring color via prop color if bordered prop is true.

Fixes #409

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

'should use custom colors' case was added to 'Components / Avatar' -> 'Theme' in Avatar.spec.tsx
Storybook story works correct without any updates.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Base: 98.43% // Head: 98.56% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (78d4333) compared to base (dadd5b9).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   98.43%   98.56%   +0.12%     
==========================================
  Files         102      102              
  Lines        4288     4307      +19     
  Branches      401      403       +2     
==========================================
+ Hits         4221     4245      +24     
+ Misses         67       62       -5     

Impacted Files	Coverage Δ
src/lib/components/Avatar/Avatar.tsx	98.07% <100.00%> (+5.36%)	⬆️
src/lib/theme/default.ts	100.00% <100.00%> (ø)

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[rluders]

@sldk-yuri is it good to review? :)

[yurisldk]

@rluders yes, it's. Take an additional look at default color pallete for avatar component lib/default.ts from line 70 to 80, please. Probably we may change/update it with new colors. Thank you.

[rluders]

I think this is fine as it is... AFAIK, people still can extend the colors as their like, and add some custom colors to their own theme. Thank you, I'm accepting this PR.

[yurisldk]

@rluders Thank you.