chore: Added a sort order parameter to activities handler

[bstasyszyn]

Paging with descending sort order currently does not work with MongoDB (issue #893) so sorting of activities is temporarily (maybe permanently) set to ascending.

Signed-off-by: Bob Stasyszyn Bob.Stasyszyn@securekey.com

[codecov]

Codecov Report

Merging #905 (d20e54d) into main (e274a57) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #905      +/-   ##
==========================================
- Coverage   89.43%   89.37%   -0.06%     
==========================================
  Files         157      157              
  Lines       14227    14226       -1     
==========================================
- Hits        12724    12715       -9     
- Misses        922      929       +7     
- Partials      581      582       +1     

Impacted Files	Coverage Δ
cmd/orb-server/startcmd/start.go	72.74% <100.00%> (ø)
pkg/activitypub/resthandler/activityhandler.go	93.69% <100.00%> (ø)
pkg/activitypub/resthandler/referencehandler.go	88.15% <100.00%> (-0.08%)	⬇️
pkg/activitypub/resthandler/resthandler.go	91.44% <100.00%> (ø)
pkg/activitypub/resthandler/serviceshandler.go	74.71% <100.00%> (ø)
...pub/service/inbox/httpsubscriber/httpsubscriber.go	90.12% <0.00%> (-9.88%)	⬇️

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