feat!: Support JS BSON v4

[nbbeeken]

Syncing the BSON-EXT library with the 4.0 version of our bson library required:

• Changing the names of the properties of the Long class from low_ and high_ to low and high
• Update the name of the Symbol class to BSONSymbol
• Adding the newer ObjectId spelling for the oid class.

Additionally we are able to do some major version changes which seem natural:

• The BSON library now initializes itself, exporting the types and functions in the same exact way that js BSON does.
• Sync the node supported version with js bson

I also fixed the benchmark tests to work with the new style of exporting. I have kept the tests using the createBSON helper to keep the diff smaller, I have those changes locally that I can do in a separate PR.

Another note, you'll notice the exported functions are called with: .bind(BSON) this is because they don't work if you pull them off the BSON instance. Without this, const {serialize} = require('bson-ext') doesn't work for example.

NODE-2944

[durran]

LGTM

[emadum]

LGTM!

[dariakp]

LGTM