[ci] prevent trailing whitespace, ensure files end with newline (#6373)

.pre-commit-config.yaml

@@ -1,3 +1,4 @@
+# exclude files which are auto-generated by build tools
 exclude: |
   (?x)^(
       build|
@@ -5,8 +6,17 @@ exclude: |
       lightgbm-python|
       lightgbm_r|
   )$
+  |R-package/configure$
+  |R-package/inst/Makevars$
+  |R-package/inst/Makevars.win$
+  |R-package/man/.*Rd$
 
 repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
   - repo: https://github.com/pycqa/isort
     rev: 5.13.2
     hooks:

src/treelearner/kernels/histogram_16_64_256.hu

@@ -158,4 +158,3 @@ DECLARE(histogram256);
 }  // namespace LightGBM
 
 #endif  // LIGHTGBM_TREELEARNER_KERNELS_HISTOGRAM_16_64_256_HU_
-