New R project experience

[JosiahParry]

Creating a new project there are two noticeable issues:

1. The color theme is ignored to some degree and the dark positron theme is used in some parts making it tough to read
2. The default name uses lower camel case which is not standard R style
3. 

[sharon-wang]

Thanks for taking the Project Wizard for a spin @JosiahParry!

I've opened https://github.com/posit-dev/positron/issues/3799 to capture issue 1 more broadly across our modals/popups.

For issue 2, I'm curious about your thoughts on the following:

• Did you end up using "myRProject" as your project name, or did you end up typing something else?
• What format would have been more expected as the default project name? Maybe "myrproject" or "my-r-project"?
• What if the project name input was blank instead, so you'd need to type in a project name (no default)?
• Would a "randomly" generated project name serve your purposes?