feat: add cpp language settings

cpp/.clang-format

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+---
+Language: Cpp
+BasedOnStyle: LLVM
+AlignAfterOpenBracket: BlockIndent
+AlignArrayOfStructures: Left
+AllowShortFunctionsOnASingleLine: None
+BinPackArguments: false
+BinPackParameters: false
+BreakBeforeBraces: WebKit
+BreakConstructorInitializers: AfterColon
+BreakInheritanceList: AfterColon
+IncludeIsMainRegex: '(_test)?$'
+LineEnding: LF
+PackConstructorInitializers: Never
+PenaltyBreakAssignment: 100
+PointerAlignment: Left
+QualifierAlignment: Left
+SeparateDefinitionBlocks: Always
+Standard: Latest
+...

cpp/.clang-tidy

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+---
+Checks: >
+  bugprone-*,
+  cert-*,
+  clang-analyzer-*,
+  clang-diagnostic-*,
+  concurrency-*,
+  cppcoreguidelines-*,
+  hicpp-*,
+  misc-*,
+  modernize-*,
+  performance-*,
+  portability-*,
+  readability-*,
+  -bugprone-easily-swappable-parameters,
+  -cppcoreguidelines-pro-type-reinterpret-cast,
+  -cppcoreguidelines-pro-bounds-pointer-arithmetic,
+  -cppcoreguidelines-pro-bounds-constant-array-index
+
+FormatStyle: file

cpp/.clangd

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+---
+Diagnostics:
+    UnusedIncludes: Strict
+    MissingIncludes: Strict
+
+Completion:
+  AllScopes: true
+
+InlayHints:
+    Enabled: No
+
+# Will possibly be supported in clangd 22
+Documentation:
+  CommentFormat: Doxygen
+...