tpl/strings: Add TrimSpace function

[jmooring]

Use https://pkg.go.dev/strings#TrimSpace so we can do this:

{{ $v | strings.TrimSpace }}

Instead of this:

{{ strings.Trim $v "\n\r " }}

In addition to having a standard definition of white space, we can pipe values into strings.TrimSpace. We can't pipe values into strings.Trim.

[github-actions]

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