Currently Mongoid monkey patches symbol with `#in`, `#lt`, `#elem_match`, etc.

As an example:

Customers.where(:name.in => ["Bob", "David"])

Mongoid also provides two other equivalent ways of doing this:

Customers.any_in(name: ["Bob", "David"])
Customers.where(name:

)

I think it is not good to monkey patch a kernel object like Symbol. This could be extracted out to a gem for users who want to keep it, but it should not be in Mongoid core.

Propose to deprecate with warning in Mongoid 7.2 and remove entirely in Mongoid 8.0.