feat(NODE-6504): Add Double as a SchemaType

[aditi-khare-mongoDB]

Summary

Motivation
Support a IEEE 754-2008 floating point 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

• Same changes as NODE-6503 but for Double.
• Add SchemaType Double, which has the following behavior:
  • its default cast method throws when provided a
    • a non-numeric string
  • it is queryable as $type: double or $type: number
• Add API Docs for new query option and new schema type

Example

const vehicleSchema = new Schema({ gasLevel: mongoose.Schema.Types.Double });

[baileympearson]

Just a few small comments