Add missing <stdbool.h> include to time.h (backport #423)

[mergify]

rmw/include/rmw/time.h uses bool as the return type of rmw_time_equal() (line 60) but does not include <stdbool.h>. This previously worked because rcutils/time.h transitively pulled in <stdbool.h> via rcutils/types.h → hash_map.h → allocator.h.

After ros2/rcutils#580 (commit 47a44cb, backported to jazzy as #583) narrowed the include in rcutils/time.h from rcutils/types.h to rcutils/types/rcutils_ret.h, this transitive chain is broken. Any C translation unit that includes rmw/time.h now fails to compile:

  rmw/include/rmw/time.h:60:1: error: unknown type name 'bool'
     60 | bool
        | ^~~~

The fix is to add #include <stdbool.h> to rmw/time.h.

Verification

  /* C translation unit that includes rmw/time.h */
  #include "rmw/time.h"

  void test_func(void) {
      rmw_time_t a = {0, 0};
      rmw_time_t b = {0, 0};
      bool result = rmw_time_equal(a, b);
      (void)result;
  }

• Create a minimal colcon workspace with rcutils:jazzy and rmw:jazzy (unfixed) and the above C file in a test C package
• colcon build in the workspace reproduced the above error
• Changing the rmw package to include the fix in this MR allowed the build to succeed.

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Claude Opus 4.6

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This is an automatic backport of pull request #423 done by Mergify.

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