[clang-tools-extra] [clang-tidy][readability-identifier-length] Add a line count threshold (PR #185319)

[Alex Dutka via cfe-commits]

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@@ -121,3 +122,16 @@ The following options are described below:
       catch (const std::exception& e) {
           // ...
       }
+
+.. option:: LineCountThreshold
+
+    Defines the minimum number of lines required between declaration and last
+    use for a diagnostic to be issued. The default value is 0.
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dutkalex wrote:

Done

https://github.com/llvm/llvm-project/pull/185319