feat(NODE-6503): Add Int32 to SchemaType

[aditi-khare-mongoDB]

This PR follows the one opened on the mongodb fork, Val's initial round of feedback has been addressed.

Summary

Motivation
Support a 32-bit integer type in mongoose for compatibility with CSFLE/QE. The current Number schema type can result in either Int32, Int64, or Doubles that are inserted into the database using type inference but CSFLE and QE require exact BSON types in schemas.

Summary of Changes

• Add SchemaType Int32, which has the following behavior:
  • its default cast method throws when provided a
    • a non-numeric string
    • a non-integer value
    • a NaN
    • a number beyond the bounds of INT32_MAX or INT32_MIN
  • it is queryable as $type: int or $type: number, but NOT $type: double
• Add API Docs for new query option and new schema type

Example

const vehicleSchema = new Schema({ numberOfTires: mongoose.Int32 });

[aditi-khare-mongoDB]

@vkarpov15

I've reopened the PR against the fork, here.

Here's a link to you open comment thread, so we can follow-up on it.