Add `inlined_format_args`, opposite to `uninlined_format_args`

What it does

Opposite of uninlined_format_args.

Advantage

Consistency. Not everything can be in lined, but everything can be 'not in-lined'.

With uninlined_format_args format!("{}", var); becomes format!("{var}");, but format!("{} {}", var, 1+2); cannot become format!("{var} {1+2}");, at best you can get format!("{var} {}", 1+2);

Drawbacks

Churn, collision with uninlined_format_args.

Example

format!("{var}");

format!("{var} {}", 1+2);

Could be written as:

format!("{}", var);

format!("{} {}", var, 1+2);

Comparison with existing lints

No response

Additional Context

No response

Start by reading the existing uninlined_format_args lint and tracing how its behavior is tested. Clarify the opposite lint’s handling of expressions such as 1+2, account for the stated churn and collision drawbacks, and consider the work complete when the examples behave consistently with the agreed design.