RUST-282 Add pretty-printed Debug implementation to Document

[NBSquare]

It looks like the only relevant struct which doesn't derive Debug is Document, so I added support for pretty-print there.

I also added a test to the end of bson.rs test.

[isabelatkinson]

this looks great, just one small formatting request

[isabelatkinson]

LGTM! Tagging in Patrick for review.

[patrickfreed]

Looks good! I just have a test suggestion and request for an existing but related issue to be fixed.

[NBSquare]

I modified the Debug implementation for ObjectId to reflect the fact that ObjectId is basically a tuple wrapping the ID slice, which meant modified a unit test or two. Check that out here.

This means that instead of printing out ObjectIds as

ObjectId(000000000000000000000000)

it will print them out as

ObjectId("000000000000000000000000")

or

ObjectId(
    "000000000000000000000000",
)

depending on the format specifier. This is an easy fix if we want to follow the pattern serde_json uses for Objects and Arrays.

[patrickfreed]

LGTM! Great job with this, especially with handling all the more ambiguous cases.

[isabelatkinson]

nice job!