feat(stepper): add disable step navigation setting

[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:

Closes #902

[codecov]

Codecov Report

Merging #1155 into master will decrease coverage by 0.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #1155      +/-   ##
==========================================
- Coverage   78.88%   78.86%   -0.02%     
==========================================
  Files         200      200              
  Lines        6062     6066       +4     
  Branches      469      469              
==========================================
+ Hits         4782     4784       +2     
- Misses       1165     1167       +2     
  Partials      115      115

Impacted Files	Coverage Δ
...work/theme/components/stepper/stepper.component.ts	46.77% <50%> (+0.22%)	⬆️