[vcpkg] install git hooks when bootstrap

[autoantwort]

Add a commit hook that checks the format of vcpkg.json files and reject the commit if the file is not properly formatted.

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Is your feature request related to a problem? Please describe.
Often users commit vcpkg.json files which are not properly formatted.

Proposed solution
See first sentence.

Describe alternatives you've considered
Maybe directly format the file and add the file to the commit. So that the user has not to do that manually, but I don't know if that is possible.