fix: Replace string-template with url-template

[MennoTammens]

Fixes #1099

Path parameters are incorrectly encoded. This fix uses a different module to parse the path parameters, using the same RFC6570 format as the API Discovery Documents uses.

From the [API Discovery Service Documentation]:(https://developers.google.com/discovery/v1/using#build-compose):

The path property of each method in the API uses URI Template v04 syntax. This property may contain variables, which are surrounded by curly braces.

In google-api-nodejs-client the special URI Template operators (+, / and *) were stripped from the path, to make the templates compatible with the string-template module.
The string-template module should be replaced with a URI Template module.

• npm test succeeds
• Pull request has been squashed into 1 commit
  • 1 commit with actual changes, 1 commit with regenerated files
• I did NOT manually make changes to anything in apis/
  • I actually did! src/apis/videointelligence/v1beta1.ts is generated with wrong formatting
• Code coverage does not decrease (if any source code was changed)
• Appropriate JSDoc comments were updated in source code (if applicable)
• Appropriate changes to readme/docs are included in PR

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and have the pull request author add another comment and the bot will run again. If the bot doesn't comment, it means it doesn't think anything has changed.

[googlebot]

CLAs look good, thanks!

[JustinBeckwith]

This is awesome! Thank you so much for the contribution. We really appreciate it. I had no idea this RFC existed. TIL 😃