Compute NaN Function

[ashmeigh]

Description
This pull request addresses the ongoing effort to standardize the execution of operations by transitioning from the partial function style to a structured compute_function approach. In this update, several operations have been refactored to adhere to the new standard. The modifications ensure a clearer separation between the setup and execution phases of each operation, improving the maintainability and readability of the codebase.

Changes made
Refactored multiple operations to implement the new compute_function approach.
Introduced static methods compute_function in each affected operation module to encapsulate the core logic for executing the operation on a per-slice basis.
Updated the calling code to use the compute_function method instead of the previous partial function style

[coveralls]

coverage: 74.385% (+0.03%) from 74.359%
when pulling e6f0eef on NaN_compute_1
into e82455a on main.

[samtygier-stfc]

It would be better to move the

if mode_value == "Constant":
    ...
else ... :
    ...

in to filter_func(), and then call separate compute functions.

That would mean we only need to check once, and can raise the value error once from outside the compute function.

[samtygier-stfc]

See comment