Add `cdktf provider update` command

[ansgarm]

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Description

This was initially part of #877 but got pulled into a separate issue.

Ideally, I would also like to be able to help me upgrade providers, e.g.

$> cdktf provider update hashicorp/kubernetes@latest
This project currently uses hashicorp/kubernetes 2.1.1. 2.3.2 is the latest available version. Upgrade? (yes)
// cdktf updates cdktf.json, gets it, gets the schema

Warning: the cron-job resources in hashicorp/kubernetes is in use in ./foo/bar/cron-job.ts, and the schema has changed between 2.1.1 and 2.3.2. You may need to modify this resource. Continue? (yes)

References