Measuring the Execution Time of Ant Targets

Two ways to do it.

Use the listener provided by antcontrib Example command:
```
ant main -listener net.sf.antcontrib.perf.AntPerformanceListener
```
Write the statistics to a file (optional): -Dperformance.log=/tmp/performance.log

Example output:

Buildfile: D:\ant-test\build.xml

hello:
     [echo] 你好

main:
     [echo] 世界

BUILD SUCCESSFUL
Total time: 0 seconds

Statistics:
-------------- Target Results ---------------------
demo.main: 0.000 sec
demo.hello: 0.006 sec

-------------- Task Results -----------------------
demo.main.echo: 0.000 sec
demo.hello.echo: 0.006 sec
demo.<implicit>.path: 0.016 sec
demo.<implicit>.property: 0.089 sec

-------------- Totals -----------------------------
Start time: 星期二, 9 八月 2022 11:31:04.365
Stop time: 星期二, 9 八月 2022 11:31:04.588
Total time: 0.223 sec

Use ProfileLogger

ant main -logger org.apache.tools.ant.listener.ProfileLogger

Result:

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (78ms)

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (2ms)

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (0ms)

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (1ms)

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (1ms)

property: started Tue Aug 09 11:21:18 CST 2022

property: finishedTue Aug 09 11:21:18 CST 2022 (1ms)

path: started Tue Aug 09 11:21:18 CST 2022

path: finishedTue Aug 09 11:21:18 CST 2022 (18ms)

Target hello: started Tue Aug 09 11:21:18 CST 2022

echo: started Tue Aug 09 11:21:18 CST 2022
     [echo] 你好

echo: finishedTue Aug 09 11:21:18 CST 2022 (5ms)

Target hello: finishedTue Aug 09 11:21:18 CST 2022 (7ms)

Target main: started Tue Aug 09 11:21:18 CST 2022

echo: started Tue Aug 09 11:21:18 CST 2022
     [echo] 世界

echo: finishedTue Aug 09 11:21:18 CST 2022 (1ms)

Target main: finishedTue Aug 09 11:21:18 CST 2022 (2ms)

BUILD SUCCESSFUL
Total time: 0 seconds