Enhance settings title generation to allow other case conventions

[mark-wiemer]

I'm authoring an extension, and I'd like to set the name of one of my settings to "Enable IntelliSense". However, the only options available to me are "Enable Intellisense" (with a small s) and "Enable Intelli Sense". Neither of these look right to me. Allowing camelCase, kebab-case, TRAIN_CASE, PascalCase, or other case conventions would enable extension authors to create more informative settings names.

[roblourens]

Covered by #70589