fix(spinner): ability to set spinner message

[nnixaa]

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:

[codecov]

Codecov Report

Merging #1508 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #1508   +/-   ##
=======================================
  Coverage   83.22%   83.22%           
=======================================
  Files         231      231           
  Lines        7503     7503           
  Branches      659      658    -1     
=======================================
  Hits         6244     6244           
  Misses       1068     1068           
  Partials      191      191

Impacted Files	Coverage Δ
...work/theme/components/spinner/spinner.directive.ts	34.21% <0%> (ø)	⬆️