Improve MongoDB type check

[emmanuelbuah]

We can not reasonably use an instanceof comparison to confirm that a given object is of type MongoDB since we may be using a different version of MongoDB than what a caller might be using. In this scenario, the check would fail.

We patched the checks using a required field in the IDbProperties object is set in #112. This required field is not a known field in MongoDB instance, thus it is arguably sane to check it
in this manner.

An ideal/better solution would be to make MongoDB a devDependency making it so the logic uses the consumer's own MongoDB package. This ticket tracks putting in place a better solution if possible.

[simon-abbott]

Mongodb was made a peer dep in 25bd088. We should revisit this.