[clang-tools-extra] [clang-tidy][readability] Ignore macros in function-size check (PR #199549)

[Zeyi Xu via cfe-commits]

https://github.com/zeyi2 commented:

Can we add a new test case that looks like this?

```cpp
#define BODY ;

void too_many_params(int a, int b, int c, int d, int e, int f) {
  BODY
}
```

with config: 
```
readability-function-size.IgnoreMacros: true
readability-function-size.ParameterThreshold: 5
```

https://github.com/llvm/llvm-project/pull/199549