Allow to override flatpak bundle name

[mahnunchik]

Pre-flight checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project uses.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Problem description

It would be helpful to be able to override flatpak bundle name.

Currently name is hardcoded: https://github.com/malept/electron-installer-flatpak/blob/d066e8b2960b167e835316c72f642e972e097756/src/installer.js#L143-L145

const name = `${this.appIdentifier}_${this.options.branch}_${this.options.arch}.flatpak`
const dest = this.options.rename(this.options.dest, name)

Proposed solution

Allow to specify artifactName

Alternatives considered

I don't know

Additional information

No response