feat(abc:page-header): add titleSub property

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #1643 (ab00906) into master (28eeceb) will not change coverage.
The diff coverage is n/a.

❗ Current head ab00906 differs from pull request most recent head 8e961be. Consider uploading reports for the commit 8e961be to get more accurate results

@@           Coverage Diff           @@
##           master    #1643   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files         281      281           
  Lines        8740     8740           
  Branches     1731     1731           
=======================================
  Hits         8353     8353           
  Misses        319      319           
  Partials       68       68           

Files Changed	Coverage Δ
packages/abc/page-header/page-header.component.ts	97.75% <ø> (ø)
packages/abc/page-header/page-header.module.ts	100.00% <ø> (ø)

[ng-alain-bot]

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