feat(button): Eva style

[yggg]

Please read and mark the following check list before creating a pull request:

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

BREAKING CHANGE:

'accent' property removed.

Static properties removed. Removed properties:
SIZE_XSMALL, SIZE_SMALL, SIZE_MEDIUM, SIZE_LARGE, STATUS_PRIMARY,
STATUS_INFO, STATUS_SUCCESS, STATUS_WARNING, STATUS_DANGER,
SHAPE_RECTANGLE, SHAPE_ROUND, SHAPE_SEMI_ROUND.
Use NbComponentSize, NbComponentStatus, NbComponentShape.

Size classes were renamed:
btn-xsmall -> size-tiny
btn-small -> size-small
btn-medium -> size-medium
btn-large -> size-large

Size getter 'xsmall' renamed to tiny.

Status classes were renamed:
btn-primary -> status-primary
btn-info -> status-info
btn-success -> status-success
btn-warning -> status-warning
btn-danger -> status-danger

Shape classes were renamed:
btn-rectangle -> shape-rectangle
btn-round -> shape-round
btn-semi-round -> shape-semi-round

'btn-outline' class renamed to 'appearance-outline'.
'btn-hero' class renamed to 'appearance-hero'.

Button theme properties prefix changed to 'button' (was 'btn').

Following theme properties were renamed:
btn-fg -> button-filled-[status]-text-color,
button-outline-[status]-[state?]-text-color,
button-ghost-[status]-[state?]-text-color,
button-hero-[status]-text-color
btn-font-family -> button-text-font-family
btn-line-height -> button-[size]-text-line-height
btn-cursor -> button-cursor
btn-[status]-bg -> button-filled-[status]-background-color
btn-[status]-hover-bg -> button-filled-[status]-hover-background-color
btn-[status]-active-bg -> button-filled-[status]-active-background-color
btn-padding-y-[size], btn-padding-x-[size] -> button-[appearance]-[size]-padding
btn-font-size-[size] -> button-[size]-text-font-size
btn-rectangle-border-radius -> button-rectangle-border-radius
btn-semi-round-border-radius -> button-semi-round-border-radius
btn-round-border-radius -> button-round-border-radius
btn-hero-shadow -> button-hero-shadow
btn-hero-text-shadow -> button-hero-text-shadow
btn-hero-bevel-size -> button-hero-bevel-size
btn-hero-glow-size -> button-hero-glow-size
btn-hero-[status]-bevel-color -> button-hero-[status]-bevel-color
btn-hero-[status]-glow-color -> button-hero-[status]-glow-color
btn-hero-[status]-left-bg -> button-hero-[status]-left-background-color
btn-hero-[status]-right-bg -> button-hero-[status]-right-background-color
btn-hero-[status]-left-hover-bg -> button-hero-[status]-hover-left-background-color
btn-hero-[status]-right-hover-bg -> button-hero-[status]-hover-right-background-color
btn-hero-[status]-left-active-bg -> button-hero-[status]-active-left-background-color
btn-hero-[status]-right-active-bg -> button-hero-[status]-active-right-background-color
btn-outline-fg -> button-outline-[status]-border-color
btn-outline-hover-fg -> button-outline-[status]-hover-border-color
btn-outline-focus-fg -> button-outline-[status]-focus-border-color

Following theme properties were removed:
btn-group-bg
btn-group-fg
btn-group-separator
btn-disabled-opacity
btn-secondary-bg
btn-secondary-hover-bg
btn-secondary-active-bg
btn-secondary-border
btn-secondary-border-width
btn-hero-secondary-bevel-color
btn-hero-secondary-glow-color
btn-hero-border-radius

'btn-pulse' status renamed to 'button-pulse'.

'btn-full-width' renamed to 'full-width'.

[codecov]

Codecov Report

Merging #1359 into next will decrease coverage by 0.03%.
The diff coverage is 91.52%.

@@            Coverage Diff             @@
##             next    #1359      +/-   ##
==========================================
- Coverage   81.85%   81.81%   -0.04%     
==========================================
  Files         237      237              
  Lines        7230     7238       +8     
  Branches      628      632       +4     
==========================================
+ Hits         5918     5922       +4     
- Misses       1124     1128       +4     
  Partials      188      188

Impacted Files	Coverage Δ
...mework/theme/components/button/button.component.ts	88.37% <91.52%> (-3.94%)	⬇️

[nnixaa]

full width doesn't seem to work

[yggg]

full width doesn't seem to work

Fixed 28cd421