feat(module:util): export stringTemplateOutlet

[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-io]

Codecov Report

Merging #324 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
+ Coverage   94.46%   94.46%   +<.01%     
==========================================
  Files         227      227              
  Lines        6055     6056       +1     
  Branches      976      976              
==========================================
+ Hits         5720     5721       +1     
  Misses        256      256              
  Partials       79       79

Impacted Files	Coverage Δ
packages/util/public_api.ts	100% <100%> (ø)	⬆️

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