[Client] Add Elapsed Time

[HassanAbouelela]

Add elapsed time to task info for boinccmd.

Fixes #3463

Description of the Change

Prints the current elapsed time of a task (RESULT), if it is still running. The property was already available to the RESULT struct.

Release Notes

Added elapsed time to boinc-cmd task information.

[codecov]

Codecov Report

Merging #3800 into master will decrease coverage by 3.74%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3800      +/-   ##
==========================================
- Coverage   19.40%   15.66%   -3.75%     
==========================================
  Files         109      136      +27     
  Lines       10140    13873    +3733     
  Branches     1770     1770              
==========================================
+ Hits         1968     2173     +205     
- Misses       8040    11568    +3528     
  Partials      132      132              

Impacted Files	Coverage Δ
lib/parse.h	0.00% <0.00%> (ø)
lib/wslinfo.h	0.00% <0.00%> (ø)
db/boinc_db_types.h	0.00% <0.00%> (ø)
lib/average.h	0.00% <0.00%> (ø)
sched/sched_shmem.cpp	0.00% <0.00%> (ø)
db/db_base.cpp	0.77% <0.00%> (ø)
lib/opencl_boinc.h	0.00% <0.00%> (ø)
lib/coproc.cpp	0.00% <0.00%> (ø)
sched/credit.h	0.00% <0.00%> (ø)
lib/sched_msgs.h	100.00% <0.00%> (ø)
... and 20 more

[davidpanderson]

Thanks!