[SERVER-19243] Allow $type to support "number" as type value - MongoDB Jira

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This is an extension to ~~SERVER-18819~~. We should add a "number" type to $type-supported string names that rolls up all number types.

Example:

> db.coll.drop()

> db.coll.insert({_id: 1, num: NumberInt('123')})

> db.coll.insert({_id: 2, num: NumberLong('123')})

> db.coll.find({num: {$type: "number"}})

{ "_id" : 1, "num" : 123 }

{ "_id" : 2, "num" : NumberLong(123) }

depends on

SERVER-18819 Allow $type to support type values as string names

is documented by

DOCS-5838 $type operator supports "number"

DOCS-5883 Document "number" alias for $type

is related to

DRIVERS-251 Allow $type to support string representations of type eg "number"

related to

SERVER-20345 Support additional queries with $type=number partial indexes