Added utility functions to convert between msg::time and std::chrono time_point

[ahcorde]

This PR is related with this issue gazebosim/gz-common#61. The idea it's to deprecate the class common::Time in favor of std::chrono.

Related with

• Deprecated common:Time gz-common#90
• Replaced common::Time for std::chrono gz-sensors#41
• Deprecated common:Time gz-common#90
• Added functions to convert between time_point and secNsec gz-math#150

Added helpers functions to convert between

• msg::Time to time_point
• time_point to msg::Time
• some tests too

Signed-off-by: ahcorde [email protected]

[chapulina]

We should also be sure to update the required ign-math version to 6.5.0 on CMakeLists. That's the same for all libraries.

[chapulina]

Pushed style updates and bumped the required ign-math version on 25e4f30, LGTM.

[codecov]

Codecov Report

Merging #81 into master will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
+ Coverage   85.69%   85.83%   +0.14%     
==========================================
  Files           7        7              
  Lines         797      805       +8     
==========================================
+ Hits          683      691       +8     
  Misses        114      114              

Impacted Files	Coverage Δ
src/Utility.cc	83.70% <100.00%> (+0.22%)	⬆️

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[chapulina]

@osrf-jenkins run tests now that the Jenkins server has been restarted

[chapulina]

Queued a new homebrew build now that ign-math 6.5.0 is in: https://build.osrfoundation.org/job/ignition_msgs-ci-pr_any-homebrew-amd64/