Encapsulate the static info to avoid string based invocations

https://github.com/ansys/pyfluent/pull/5287#issuecomment-5167115908

Based on the above discussion:
1. The string based invocations can be avoided by encapsulations
2. Put the dirty code in the v0.

Later when v0's backwards compatibility is resolved (i.e. v0 is removed), we will not have this issue at all.

Start with the discussion in PR 5287, especially the referenced issue comment, to identify the static information and string-based invocations in scope. Determine how the encapsulation should coexist with the v0 compatibility code; done means the targeted string-based invocations are avoided without resolving the broader v0 backwards-compatibility work.

Written by the indexing model from the issue text.