The compile_uri_template() function is not consistent with compiled router regarding tailing slash.

I don't know either what the plan for compile_uri_template() is. I think it is left as a utility method for building custom routers, and I suppose, may continue to exist as such.

This PR does a good job at explaining the status quo, so maybe let's just merge it, and create a new issue for making this method slightly more consistent with CompiledRouter.

Originally posted by @vytas7 in #1961 (review)

The options may be

• to leave it as is, with the warning provided by the above referenced pr
• add a flag to select what behaviour to have
• deprecate and eventually remove it, since it's not used internally by falcon.