feat(tabs): add disabled property

[nnixaa]

Closes #387

[codecov]

Codecov Report

Merging #1141 into master will decrease coverage by 0.06%.
The diff coverage is 10%.

@@            Coverage Diff             @@
##           master    #1141      +/-   ##
==========================================
- Coverage   79.14%   79.08%   -0.07%     
==========================================
  Files         200      200              
  Lines        6100     6106       +6     
  Branches      473      475       +2     
==========================================
+ Hits         4828     4829       +1     
- Misses       1152     1157       +5     
  Partials      120      120

Impacted Files	Coverage Δ
.../components/route-tabset/route-tabset.component.ts	66.66% <0%> (-4.77%)	⬇️
...mework/theme/components/tabset/tabset.component.ts	54.16% <14.28%> (-3.98%)	⬇️