style: clang-tidy auto fixes (#1530)

Fixes #1529. 
---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sergey Kuznetsov <skuznetsov@ripple.com>

.clang-tidy

@@ -142,7 +142,7 @@ CheckOptions:
   readability-braces-around-statements.ShortStatementLines: 2
   bugprone-unsafe-functions.ReportMoreUnsafeFunctions: true
   bugprone-unused-return-value.CheckedReturnTypes: ::std::error_code;::std::error_condition;::std::errc
-  misc-include-cleaner.IgnoreHeaders: '.*/(detail|impl)/.*;.*(expected|unexpected).*;.*ranges_lower_bound\.h'
+  misc-include-cleaner.IgnoreHeaders: '.*/(detail|impl)/.*;.*(expected|unexpected).*;.*ranges_lower_bound\.h;time.h;stdlib.h'
 
 HeaderFilterRegex: '^.*/(src|tests)/.*\.(h|hpp)$'
 WarningsAsErrors: '*'

.clangd

@@ -9,3 +9,5 @@ Diagnostics:
       - ".*/(detail|impl)/.*"
       - ".*expected.*"
       - ".*ranges_lower_bound.h"
+      - "time.h"
+      - "stdlib.h"

src/util/TimeUtils.cpp

@@ -19,7 +19,6 @@
 
 #include "util/TimeUtils.hpp"
 
-#include <time.h>
 #include <xrpl/basics/chrono.h>
 
 #include <chrono>

tests/unit/rpc/handlers/LedgerIndexTests.cpp

@@ -29,9 +29,9 @@
 #include <boost/json/value.hpp>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
-#include <stdlib.h>
 
 #include <cstdint>
+#include <cstdlib>
 #include <string>
 #include <vector>