(WIP) feat: add list permission

[genu]

Resolves #982

This PR is an initial attempt to add a list permission. Putting here for visibility.

@ymc9 If you have some time, could you offer some guidance on the relevant code that would need to be updated, or anything else that would be helpful here.

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[ymc9]

Thank you for starting this @genu ! It's something wanted by many.

I think the basic implementation should be straightforward. The call path for findXXX proxy is:

PolicyProxyHandler.findXXX -> PolicyProxyHandler.doFind -> PolicyUtils.injectForRead

PolicyUtils.injectForRead is the unified function for injecting "read" related policies. Here' you can see currently only "read" policies are injected:

zenstack/packages/runtime/src/enhancements/node/policy/policy-utils.ts

Lines 609 to 612 in b41fd93

	if (!this.injectAuthGuardAsWhere(db, injected, model, 'read')) {
	args.where = this.makeFalse();
	return false;
	}

I think what needs to be done is to further inject "list" policies.

Also, the "list" policy should only govern "findFirst" and "findMany", not "findUnique". We should probably introduce a boolean flag to distinguish these two cases.

I guess the proxy code is not entirely easy to read and understand 😅. Let me know if you need more clarifications.

[ymc9]

Another complication is, whether "list" should govern groupBy call, since groupBy is partly "listing" data as well. What do you think?