tpl/collections: Add like operator to where function

[jmooring]

Enables constructs such as:

{{ range where site.RegularPages "Params.foo" "like" "^ab" }}
  <h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}

Will submit documentation change to the documentation repository is this is merged.

Closes #11279

[github-actions]

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