Improve simulated communication delay

[at-wat]

Simulated communication delay was inaccurate on some environments due to asynchronous wait on single io_service.
Use synchronous wait on separate threads to fix the accuracy.

urg_stamped/Status message containing internal timestamp estimation status is published.

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 80.39%. Comparing base (eb0c348) to head (a78a486).

Files	Patch %	Lines
src/urg_sim/urg_sim.cpp	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   80.07%   80.39%   +0.32%     
==========================================
  Files          31       31              
  Lines        1270     1301      +31     
==========================================
+ Hits         1017     1046      +29     
- Misses        253      255       +2     

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[sqbot]

[177] PASSED on noetic

All tests passed

build/test_results/urg_stamped/gtest-test_decode.xml: 4 tests
build/test_results/urg_stamped/gtest-test_device_time_origin.xml: 6 tests
build/test_results/urg_stamped/gtest-test_first_order_filter.xml: 6 tests
build/test_results/urg_stamped/gtest-test_param.xml: 12 tests
build/test_results/urg_stamped/gtest-test_timestamp_moving_average.xml: 6 tests
build/test_results/urg_stamped/gtest-test_timestamp_outlier_remover.xml: 4 tests
build/test_results/urg_stamped/gtest-test_walltime.xml: 4 tests
build/test_results/urg_stamped/roslint-urg_stamped.xml: 1 tests
build/test_results/urg_stamped/rostest-test_tests_e2e.xml: 1 tests
build/test_results/urg_stamped/rosunit-e2e.xml: 6 tests
Summary: 50 tests, 0 errors, 0 failures, 0 skipped