tpl/strings: Add strings.ReplacePairs function

[jmooring]

Closes #14594

I recognize that the type checking (types.TypeToString) is more strict than in other strings functions, but for this particular function using something like cast.ToStringSliceE just doesn't feel right. So we're strict (string or any of the template types) on both the input and the replacement pairs.

The signature is:

strings.ReplacePairs OLD NEW [OLD NEW ...] INPUT

So you can do this:

{{ "aabbcc" | strings.ReplacePairs "a" "x" "b" "y" "c" "z" }} → xxyyzz

Or this:

{{ $pairs := slice
  "a" "x"
  "b" "y"
  "c" "z"
}}
{{ "aabbcc" | strings.ReplacePairs $pairs }} → xxyyzz

docs: https://deploy-preview-3424--gohugoio.netlify.app/functions/strings/replacepairs/

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