[style]: Clean up lint issues from .clang-tidy scan in C++ code #489
Description
- Add braces to one-line if statements for consistency style(hll): Add braces to single-line if statements for consistency #488 style(kll): Add braces to single-line if statements for consistency #487
- Unify naming conventions for variables/functions
- Fix "performance-unnecessary-copy-initialization": Remove unnecessary copy construction perf: Replace push_back with emplace_back to optimize object construc… #486
- Fix "modernize-*" issues