SchemaType-level global setters to go along with global getters

[vkarpov15]

Prerequisites

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• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

In #11462, I ran into an issue where you can set a global getter on all date instances:

mongoose.Schema.Types.Date.get(v => {
  return Temporal.Instant.fromEpochSeconds(v.valueOf() / 1000);
});

But there's no way to set a corresponding global setter.

Motivation

Getters and setters are complementary, and while it is definitely possible to get a lot out of global getters without global setters, having both is necessary.

The major roadblock is that we use SchemaType.get() to define global getters... but SchemaType.set() is already used to set global schematype options. So we may instead need to do something like mongoose.Schema.Types.Date.setters.push(...) instead of mongoose.Schema.Types.Date.set().

Example

No response