Add functionality in Variable object to remove current Operations

[williamfgc]

Why is this feature important?
Allows for applying operations (e.g. compression) only at certain steps depending on certain conditions.

What is the potential impact of this feature in the community?
User have more flexibility to storage compress data or not.

Is your feature request related to a problem? Please describe.
The current functionality is all (steps) or nothing for compression.

Describe the solution you'd like and potential required effort
A function like Variable<T>::RemoveOperations() would do the work

Describe alternatives you've considered and potential required effort
A function that modifies the current Operations vector, but it could be more work than required

Additional context
Might have to be added to C++, C, Fortran, Python bindings.
Need to check if high-level bindings might be affected (or it's a current bug).
Will do a PR to illustrate the API usage.