Add error_format_without_sources lint

[sruggier]

This PR adds a new lint that triggers whenever a formatting operation (Display or Debug) is directly invoked on an instance of an std::error::Error type that may provide cause information. It ignores Error types that don't provide a non-default implementation of the source function.

To catch bad uses of logging related macros, I chose to make the lint trigger on code within proc macros. Because of that, the implementation isn't able to use FormatArgsStorage unless FormatArgsCollector is updated to collect instances from inside proc macro expansions.

I'm opening this in a draft state to see if there's openness to updating FormatArgsCollector, and solicit feedback in general. For what it's worth, I've used the lint in a large codebase, and it works quite well, so I think it's worth adding in some form.

Fixes #10076.

Review checklist:

• Followed lint naming conventions
• Added passing UI tests (including committed .stderr file)
• cargo test passes locally (dogfood fails because of a few warnings from the new lint)
• Executed cargo dev update_lints
• Added lint documentation
• Run cargo dev fmt

My own checklist of possible improvements:

• Use a more elegant name
• Trigger on generic code
• Trigger on &dyn Error, Box<&dyn Error>, etc.
• Add a pair of configuration options allow use of Display or Debug on specific types
• Add separate configuration options to conditionally allow based on whether alternate flag is used (to implement within proc macros, requires either FormatArgsStorage, or parsing of encoded template byte array, which is painful)
• Add a configuration option listing specific proc macros to ignore, as an escape hatch for bad code emitted from proc macros
• options to configure suggestions, to enable automated fixes for large codebases
• ignore empty enum variants, because they cannot have a linked source (possibly too magical, and would require some heroics, if possible at all)

changelog: [error_format_without_sources]: new lint added

[github-actions]

Lintcheck changes for 1dc0be0

Lint	Added	Removed	Changed
clippy::error_format_without_sources	72	0	0

This comment will be updated if you push new changes

[rustbot]

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[sruggier]

@rustbot reroll

[sruggier]

I opened this PR, as it is, mainly to solicit feedback before working on it further, but based on the lack of response, I had to assume that the failing tests were discouraging review, so I've fixed them.

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.