fix: npm 8 does not install plugin dependencies

[erisu]

Motivation and Context

Installing Cordova Electron plugins does not install the Electron scope dependencies since npm 8.

Might be related to: npm/cli#2339

Description

This PR will npm install the sub-package dependencies before installing the sub-package to the Electron app scope.

The only potential side-efect is a slight increase in performance, but this resolves the changes that were made in npm 7 or 8.

npm 8 will only create a symlink to the sub-package without installing.

Testing

• npm t
• cordova run with cordova-plugin-device installed.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

Merging #229 (fa51d19) into master (de5e8bd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #229   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          653       654    +1     
=========================================
+ Hits           653       654    +1     

Impacted Files	Coverage Δ
lib/handler.js	100.00% <100.00%> (ø)

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