feat(alert): Eva theme

[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:

NbAlertComponent 'closableValue' replaced with 'closable'.

All NbAlertComponent static fields removed.
SIZE_XXSMALL, SIZE_XSMALL, SIZE_SMALL, SIZE_MEDIUM, SIZE_LARGE,
SIZE_XLARGE, SIZE_XXLARGE, STATUS_ACTIVE, STATUS_DISABLED,
STATUS_PRIMARY, STATUS_INFO, STATUS_SUCCESS, STATUS_WARNING,
STATUS_DANGER, ACCENT_ACTIVE, ACCENT_DISABLED, ACCENT_PRIMARY,
ACCENT_INFO, ACCENT_SUCCESS, ACCENT_WARNING, ACCENT_DANGER,
OUTLINE_ACTIVE, OUTLINE_DISABLED, OUTLINE_PRIMARY, OUTLINE_INFO,
OUTLINE_SUCCESS, OUTLINE_WARNING, OUTLINE_DANGE.

Active status removed.
Disabled become input instead of status value. Disabled class renamed to
'disabled'.

NbAlertComponent 'hasAccent', 'hasStatus', 'hasOutline' getters removed.

Status class names changed to 'status-[status-name]'.
Outline class names changed to 'outline-[status-name]'.
Accent class names changed to 'accent-[status-name]'.

Following theme properties were renamed:

alert-font-size -> alert-text-font-size
alert-line-height -> alert-text-line-height
alert-font-weight -> alert-text-font-weight
alert-fg -> alert-text-color
alert-bg -> alert-background-color
alert-disabled-bg -> alert-disabled-background-color
alert-disabled-fg -> alert-disabled-text-color
alert-primary-bg -> alert-primary-background-color
alert-info-bg -> alert-info-background-color
alert-success-bg -> alert-success-background-color
alert-warning-bg -> alert-warning-background-color
alert-danger-bg -> alert-danger-background-color
alert-height-xsmall -> alert-tiny-height
alert-height-small -> alert-small-height
alert-height-medium -> alert-medium-height
alert-height-large -> alert-medium-padding
alert-height-xlarge -> alert-large-height
alert-closable-padding -> alert-closable-start-padding
alert-margin -> alert-bottom-margin

Following theme properties removed:
alert-outline-fg
alert-active-bg
alert-height-xxsmall
alert-height-xxlarge
alert-button-padding

[nnixaa]

I don't think we need a disabled alert. It was a part of available statuses in Nebular 3, let's remove it now.
Unless you see a usecase.

[yggg]

Removed in 375931a

[codecov]

Codecov Report

Merging #1406 into next will decrease coverage by 0.07%.
The diff coverage is 94.59%.

@@            Coverage Diff             @@
##             next    #1406      +/-   ##
==========================================
- Coverage   82.76%   82.68%   -0.08%     
==========================================
  Files         238      238              
  Lines        7280     7227      -53     
  Branches      637      637              
==========================================
- Hits         6025     5976      -49     
+ Misses       1068     1064       -4     
  Partials      187      187

Impacted Files	Coverage Δ
...mework/theme/components/search/search.component.ts	79.48% <ø> (ø)	⬆️
...ramework/theme/components/alert/alert.component.ts	96.36% <94.59%> (+1.91%)	⬆️