[log] add Android log system support

[zhanglongxia]

Developers can use the command ot-ctl log level 5 to change the default log level to DEBUG. Sometimes, the ot-daemon crashes before developers can run the ot-ctl command on Android.

This commit adds the Android log system support, so that developers can run the command setprop log.tag.ot-daemon DEBUG to change the log level before the ot-daemon runs. The log output format is the same with using the Linux log system.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.92%. Comparing base (2b41187) to head (e4765e5).
Report is 885 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2614      +/-   ##
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- Coverage   55.77%   45.92%   -9.86%     
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  Files          87      106      +19     
  Lines        6890    12624    +5734     
  Branches        0      915     +915     
==========================================
+ Hits         3843     5797    +1954     
- Misses       3047     6511    +3464     
- Partials        0      316     +316     

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[superwhd]

LGTM 👍

[wgtdkp]

Thanks!

[wgtdkp]

Developers can use the command ot-ctl log level 5 to change the default log level to DEBUG. Sometimes, the ot-daemon crashes before developers can run the ot-ctl command on Android.

This commit adds the Android log system support, so that developers can run the command setprop log.tag.ot-daemon DEBUG to change the log level before the ot-daemon runs.

Will ot-ctl log level 5 continue working on Android?

[zhanglongxia]

Will ot-ctl log level 5 continue working on Android?

The final minimum output log level is determined by the highest value of OT log level and Android log level. For example, if the Android log level is set to DEBUG, the ot-ctl log level 5 works. If the Android log level is set to INFO, the ot-ctl log level 5 doesn't work.