☂️ linter support for records

[pq]

A meta-issue to discuss and track work on linter support for records.

Updates:

• 🤔 consider extending require_trailing_commas to include record expressions #58851
• extend non_constant_identifier_names to include record type declarations #58836
• extend prefer_const_declarations to encourage const record literals #58839
• extend non_constant_identifier_names to include record fields #58835
• dart2js: unnecessary 'var' in generated code when assigning to a parameter. #3627
• extend unnecessary_const to include record expressions #58842
• extend constant_identifier_names to include record expressions #58843
• language/library2_negative_test is invalid #3649
• File matches (in searchbox proposals) include svn metadata files #3648

Additions:

• ➕ [records] new lint: no_types_as_field_names #58841

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/fyi @munificent @bwilkerson @goderbauer