[UIK-2617][counter] update value names for size prop

[j-mnizhek]

Changelog

@semcore/counter

Changed

• value names for size property to match the whole size system in DS: 'm', 'l', 'xl' -> 's', 'm', 'l'.

Motivation and Context

We need to update value names for size property to match the whole size system in DS: 'm', 'l', 'xl' -> 's', 'm', 'l'. So that designers and devs will have more convenient list to choose the appropriate size for different components.

• Updated values in the Counter component
• Updated them in Playground as well
• Default size was set from m to 's', so that teams won't have the unpredictable increasing of counters across all their interfaces

How has this been tested?

Manually.

Screenshots (if appropriate):

Before

After

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Nice improve.

Checklist:

• I have updated the documentation accordingly.
• I have added new tests on added of fixed functionality.