Rename functions, arguments, variables according to RUFF linting

[bensteUEM]

Rename all items required to fix the following Ruff linting issues

"N802", #function lowercase -> breaking change
"N803", #argument lowercase -> breaking change
"N806", #variable name lowercase -> breaking change

These renames will be breaking changes therefore part of a major release
Followup of #102

[bensteUEM]

related to #50