Fix/imports of TemplateService b/w cli & runtime

[jackey8616]

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#1573

Only partially fix the incorrect import b/w @tsoa/cli & @tsoa/runtime.
Still finding a way to solve hapi & koa's dependency imports.

[ManfredLange]

If this helps to clearly separate between cli and runtime, and since this addresses the issue with the cli being imported in the tsoa-generated files, I'd love for this PR to be considered for merging as soon as possible. Thank you!