Consider calling the `schema` package `dto`

[devraj]

Is your feature request related to a problem? Please describe.
Even from the beginning I have not been happy with using schema for the package that stores the pyndatic schemas used for fastapi routers to send and receive data.

I noticed that the taskiq examples repository calls this dto which stands for data transfer object which is a more appropriate name.

Describe the solution you'd like
Rename schema to dto and update documentation

Describe alternatives you've considered
NA

Additional context
NA