feat(package): migrate to ng12

[asithade]

** PR Checklist
Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/fulls1z3/ngx-cache/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
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

** What is the current behavior?
The current build uses angular 9

Issue Number: #138 #136

** What is the new behavior?
Allows packages to work with Angular 12

** Does this PR introduce a breaking change?

[x] Yes
[ ] No

** Other information

[ghost]

Sider has detected 2 warnings on analyzing the commit 69fa083.

• ⚠️ Goodcheck
• ⚠️ TSLint

We recommend fixing them as possible by updating the dependencies, configuring the analysis tool, configuring sider.yml, turning off unused tools, and so on.

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[fulls1z3]

@asithade need help with these PR's, especially with ng-packagr is failing. once done aim is first to ng 10 and then eventually to ng11 and ng12 (supporting all intermediate versions)

• update deps ngx-meta#216
• update deps ngx-config#169
• update deps #141
• update deps ngx-auth#135

and finally we're showcasing it on fulls1z3/universal#755