cdktf-cli: support local --template files

[icholy]

Description

I have some private templates which I don't want to upload anywhere. The --template option allows providing a URL to a zip file. Ideally, I could point it at templates on my local filesystem.

References

#3657

Help Wanted

• I'm interested in contributing a fix myself

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[icholy]

After some real-life experience with #3657, what I actually want to do is point it at a template directory. Having the template as a zip committed to the repo is pretty clunky. Also, the way I'm using the file:// scheme is not correct. file:// URIs do not support relative paths.

In light of this, I would like to change the design to work like this:

• If the template string starts with http(s):// download the zip.
• If the template string is an exact match to a built-in template, use that.
• Otherwise treat it like a local directory.