Add TemplatePageFilter to filter by TemplatePathInfo

[deveth0]

The AEM Page's list Children method allows the usage of a filter to select only a limited set of childpages. This becomes handy when combined with the TemplatePathInfo Interface.

[codecov]

Codecov Report

Merging #5 into develop will decrease coverage by 0.23%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           develop      #5      +/-   ##
==========================================
- Coverage    85.64%   85.4%   -0.24%     
==========================================
  Files           30      31       +1     
  Lines          829     836       +7     
  Branches       142     143       +1     
==========================================
+ Hits           710     714       +4     
- Misses          67      69       +2     
- Partials        52      53       +1

Impacted Files	Coverage Δ
...va/io/wcm/wcm/commons/util/TemplatePageFilter.java	57.14% <57.14%> (ø)

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[stefanseifert]

thanks - i've moved the new class to a separate package and did some minor cosmetic changes and API cleanup.