feat: add integrity digest plugin

[nmggithub]

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• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
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Summarize your changes:

This follows up electron/asar#380, which implements a management API for electron/electron#48587.

Some additional things we might want to do:

1. Add the plugin to https://github.com/electron/forge/blob/next/packages/api/core/src/api/init-scripts/init-npm.ts
2. Add the plugin to the default templates.
3. Anything else beyond the plugin simply existing.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​electron/​asar@​4.1.0

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[erickzhao]

Plugin code seems pretty straightforward but we need to update some config stuff on the library side (^:

[nmggithub]

Thanks for the comments @erickzhao !

What are your thoughts on these three line items from my original post?

1. Add the plugin to https://github.com/electron/forge/blob/next/packages/api/core/src/api/init-scripts/init-npm.ts
2. Add the plugin to the default templates.
3. Anything else beyond the plugin simply existing.