feat: Add installDir property for NsisUpdater

[panther7]

Add installDir property for NsisUpdater. Now is it posible change install folder from AppUpdater.

#6818

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🦋 Changeset detected

Latest commit: 8468213

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
electron-updater	Minor

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[mmaietta]

I'm not sure if this is the correct location for an NSIS-only property. Would it perhaps be better to add to NsisUpdater.ts as a property there?
Users would need to cast an updater to NsisUpdater first though in order to use it. What are your thoughts?

[mmaietta]

I'm still not in favor of this PR as mentioned here: #6907 (comment)

We shouldn't add os-specific properties to the base AppUpdater

[panther7]

@mmaietta Moved to NsisUpdater.ts

[panther7]

Hi Mike,
all changes applied, what now?
Thanks

@mmaietta