feat(Icon): Teams theme add static outline and filled classes to SVG icons

[miroslavstastny]

Closes #716.

• Add teamsIconSlotClassNames.outline and filled to all SVG icons in Teams theme which have outline and/or filled paths,
• do the same for all ProcessedIcons in Teams theme,
• add UT to verify these classes on Teams icons,
• Use teamsIconSlotClassNames instead of hardcoded class names in theme styles,
• update CHANGELOG.

[miroslavstastny]

This does not cover all possible Icon flavors, but works for all Teams theme icons.
Instead of implementing universal test now, let it fail and iterate.

[codecov]

Codecov Report

Merging #834 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #834   +/-   ##
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  Coverage   93.54%   93.54%           
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  Files          21       21           
  Lines         728      728           
  Branches       69       73    +4     
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  Hits          681      681           
  Misses         47       47

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[kuzhelov]

don't like the fact that this class name data is repeated for every icon while, in fact, it provides the same information as classes.outlinePart. We might think about some way to provide classes via styles, via dedicated prop - so that this repetition will be avoided.

const iconStyles = ({ ... }) => ({
  root: ....,
  outlinePart: {
     ...
      classes: ['outline']
  }
})

Note that this will be quite safe move (as it is quite easy to filter out this prop before Fela transformations), as well as we will still preserve full control of this aspect being provided to the client's hands (so it will be up to client to decide on class names policy, extend this set, etc)