cli: use decompress to decompress plugins

[paul-marechal]

unzip-stream does not restore file permissions when decompressing
archives.

This commit replaces this library by decompress which restores file
permissions as stored in the archives.

Signed-off-by: Paul Maréchal paul.marechal@ericsson.com

What it does

Fixes #8306

How to test

• You should not be able to reproduce the following issue: vscode extension downloaded with @theia/cli script: files lose exec permission #8306
• Nothing should be left in the temp storage (resources used by the script, prefixed by theia-plugin-download).

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• as a reviewer, I agree to behave in accordance with the review guidelines

[vince-fugnitto]

The changes work very well 👍 :

• the decompressed plugins retain their file permissions
• decompressing still works correctly (handling is still correct as well (errors + skipping))
• less overall dependencies now that we reuse decompress

This is the result after attempting to download and decompress yangster:

gitpod /workspace/theia $ ls -lh plugins/ | grep "yangster"
drwxr-xr-x 3 gitpod gitpod 4.0K Aug  6 12:32 yangster

I'll give @marcdumais-work a chance to review as well.

[marcdumais-work]

LGTM - I added yangster in package.json and ran yarn download:plugins and checked that the unzipped extension has its LS startup script with correct exec perms:

[marcdumais-work]

LGTM, thanks @marechal-p