Auto merge of #20213 - nical:tidy-alphabetical-bs, r=jdm

Add the option in servo-tidy to not check for alphabetical ordering.

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An option to disable checking for alphabetical ordering of use/mod/extern crate statements in servo-tidy.

These checks are still enabled by default but WebRender will turn them off.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because it doesn't affect servo.

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